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You are watching: The origin that the vastus medialis muscle shares with the vastus lateralis is the __________.

StatPearls . Endowment Island (FL): StatPearls Publishing; 2021 Jan-.


Anatomy, Bony Pelvis and also Lower Limb, Thigh Quadriceps Muscle

Bruno Bordoni; Matthew Varacallo.

Author Information


The quadriceps femoris is the many voluminous muscle the the person body.

From a sporting suggest of view, that is one extraordinarily essential muscle, yet due to the stress it receives, it is frequently subject come trauma. The quadriceps is crucial for daily activities, such as climbing stair or acquiring up native the chair. Quadriceps can become a diagnostic device in some pathological conditions, studying the intrinsic adaptations that muscle tissue. Part flaps of muscle tissue can be offered to repair components of the skull or various other contractile districts.

Recent information on the function and anatomy that this muscle will boost the understanding of the practical coordination between the different vasti and permit implementation the a clinical and rehabilitative approach. That is functions impact the knee joint, i know well joint, posture, walking, and also the relationship in between the pelvis and the spine.

Structure and Function

The actions of the quadriceps femoris have consequences on the knee and also hip joints. The rectus femoris can flex the hip, while its synergistic action with vastus lateralis, vastus medialis, and also vastus intermedius extend the knee.

The myoelectric balance that the quadriceps is crucial for a correct movement of the patella.

The proprioceptive afferents that the muscle contribute to keeping adequate posture. Recent studies present that the activation of this afferents enables the contralateral quadriceps muscle to boost its coordination, boosting postural balance. The quadriceps allows an live independence walk, helps through stair climbing, and enables one come lift indigenous a chair.

The rectus femoris can activate its fibers in the longitudinal mode. It deserve to activate the proximal yarn in the lack of contraction of the many distal fibers. If the action of the quadriceps continues, it will certainly activate the most distal fibers, in the absence of the many proximal ones. That is more than likely a system to delay the onset of fatigue.

The patellar tendon insertion the the vastus medialis is small and is no able to generate a force capable of medially stabilizing the patella during knee extension. The force expressed by the vastus medialis during the expansion is modest. In reality, during its contraction, it pulls the aponeurosis the the vastus intermedius, counteracting the lateral forces on the patella that the vastus lateralis. The vastus medialis plot indirectly as a patellar stabilizer, place its contractile pressure on the mean axis of the femur.

The stamin expressed through the vastus lateralis rises with the increase in knee flexion. This system is due to the size of the fibers contrasted to the connective structure of the muscle. Longer fibers express higher strength and also make much better use that the elasticity or resistance of the connective tissue. As soon as the knee is extended, the vastus lateralis areas a little force the is useful for preserving the position with minimal effort.

The following are the features of the quadriceps muscle:

It is composed of the rectus femoris (RS) that originates indigenous the anterior worse iliac spine through the direct tendon, and also the upper rim that the acetabulum with the indirect tendon. With a third and tiny tendon (reflected tendon), it attaches come the hip share capsule anteriorly. The very first 2 RS tendons proceed downward v two aponeurotic laminae, as much as two-thirds that the rectus femoris. The direct tendon will end up being the superficial lamina while the indirect tendon proceeds as a main sagittal lamina.
The vastus lateralis (VL) that originates native the lateral confront of the great trochanter, native the gluteal tuberosity and also the lateral lip the the linea aspera.
The vastus medialis (VM) the takes an assault from the anatomical neck that the femur and also the medial lip that the linea aspera. The vastus medialis is deeply placed in the aponeurosis that the vastus intermedius, if the tensor of the vastus intermedius is placed in the same aponeurosis, an ext superficial.
The vastus intermedius (VI) originates indigenous the proximal three-fourths of the anterior and also lateral encounters of the femoral body, and also from the lateral lip that the linea aspera. Part bundles that the vastus intermedius are put in the upper recess of the supra-patellar bursae, comprising the articular muscle the the knee.

The 4 heads room directed downward to type a solitary tendon, the quadriceps muscle tendon, which fits top top the patella. The most superficial yarn of the tendon continue and also cover the patella, inserting itself on the tibial tuberosity dubbed the patellar ligament. The connective fibers of the vastus lateralis and vastus medialis attach us to the margins of the patella; the connective fibers of the vastus intermedius insert at the base of the patella. Part connective fibers come from the RS, and together with connective yarn of vastus lateralis/vastus medialis, will form the lateral and also medial retinacula that the patella.

Recently, another muscle, the tensor that the vastus intermedius (TVI), has been determined as part of the quadriceps femoris. The tensor that the vastus intermedius starts indigenous the anteroinferior section of the an excellent trochanter. The joins with a large flat aponeurosis between vastus lateralis and vastus intermedius in the main area of the thigh, and they join with a solitary tendon in the upper part of the patella, merging into the quadriceps tendon. In ~ the dorsal level that the thigh, the muscle fibers of this 3 muscle merge in the vicinity of the linea aspera the the femur. In ~ the level that the an excellent trochanter, this muscle also can originate from the gluteus minimus.

We execute not understand much about its functions; however, it more than likely allows, together with the other districts, a correct activity of the patella and/or place the intermedius muscle in tension.


The body buds exit from the ventrolateral surface of the human body wall. The jewel contain the mesenchyme the somatopleural, covered by an apical ectodermal crest. The cell of the hypomere (ventral component of the myotome of a somite) move from the somite within the sprout to type the muscle cells. The connective tissue of the four derives from the mesenchyme of the somatopleural. This happens about the fifth week the gestation. The gems rotate around 90 levels medially, in addition to a longitudinal axis. This movement of the knee area will certainly be situated in the front portion.

Blood Supply and Lymphatics

The femoral artery nourishes the quadriceps muscle. It to represent the continuation of the outside iliac artery (behind the inguinal ligament). The descends in the anteromedial part of the thigh come the ring the the adductor channel whereby it i do not care a popliteal artery. The is feasible to imagine the femoral artery as a right line connecting the facility of the inguinal canal to the posterior section of the medial condyle that the femur. Among its most important branches for the quadriceps muscle, we cite the superficial and also deep femoral artery.

The femoral vein is the extension of the popliteal vein, to arrive, adhering to the path of the femoral artery, as much as the inguinal ligament, and become the outside iliac vein.

The lymphatic ship of the reduced limb with the lumbar aortic lymph nodes, i beg your pardon are component of the right and left lumbar trunks; drainage will reach the cisterna chyli.


The femoral nerve originates from L2 to L4, innervating the contractile areas of the thigh anteriorly (quadriceps muscle, sartorius muscle), of the i know well (comb) and also the skin in the anteromedial part of the thigh, knee, leg, and the back of the foot. It additionally contains fibers from L1. The root converge downward and sideways in the thickness that the huge psoas muscle, authorized in a solitary trunk close to the transverse process of L5. The formed nerve descends and also exits caudally native the outer part of the psoas muscle and continues traveling caudally in the center of the psoas/iliac muscle complex. In this area, the is covered by the iliac fascia i beg your pardon separates it from the parietal peritoneum, the cecum colon ~ above the right and the sigmoid colon on the left.

The fascial system that constitutes the nerve problems not only the tissues it the cross from the electrical suggest of view but also from the mechanical allude of view. This is due to the fact that a reduction in the elasticity will certainly decrease the ability of the joints that are connected by its i to move. When an entrapment syndrome is recorded, the nerve acts prefer a fascial brake.

Arriving at the inguinal ligament, the femoral nerve adheres to the iliopsoas musculature and divides right into some ramifications at about 2 centimeters beyond the inguinal ligament, medial to the sartorius muscle and lateral come the femoral artery. The nerve in this area is more comprehensive and flattened; in part subjects, the nerve can come to be arborized before it passes the inguinal ligament. At this level, the femoral nerve gives little superficial ramifications to the skin and also the fascial structures.

Before branching, the femoral nerve beginning (having pass the inguinal ligament) into the femoral lacuna (consisting that the femoral nerve and also the iliopsoas muscle complex).

It continues in the Scarpa triangle or femoral triangle (pyramidal fossa v the caudal oriented apex found in the anterosuperior and medial area the the thigh, wherein the apex is formed by the adductor and also sartorius muscle, the lateral part consists the the sartorius muscle, and also the medial one from the lengthy adductor). Right here there are vessels and lymphatic pathways (the Cloquet lymph node).

The effects of the femoral nerve are uncovered for the most component in the Scarpa triangle, whereby we find the medial sartorius nerve, the pectineus nerve, the medial and also lateral musculocutaneous nerve, the femoral nerve command to the quadriceps muscle branches through the various vasti muscles, and also the saphenous nerve.

The femoral nerve command to the vastus lateralis is divided into 2 branches, which will divide right into 2 various other branches each through a food from anteriorly and also proximally to posteriorly and also distally.

The femoral nerve innervating the vastus medialis follows the anteromedial border of the muscular district. The vastus intermedius obtain innervation indigenous the femoral nerve, which come in the medial part of the vastus. The tensor the the vastus intermedius is innervated beginning from its proximal portion. The rectus femoris obtain innervation close to the anterior worse iliac spine.


The femoral quadriceps muscle has an ext superficial anaerobic yarn while going to the depth, and there will be more aerobic fibers. The an initial fibers are much less vascularized 보다 the oxidative fibers; the white fibers will certainly be triggered after the activation of the red fibers. During a contraction, there will be slow deoxygenation that the depths fibers.

Men express a greater percentage that contractile strength and also speed 보다 women, probably since men have greater muscle mass for men and hormone levels. Testosterone facilitates the rate of the motor unit"s electrical impulse, promotes a higher amount and also speed the calcium relax within the yarn (faster contraction), and stimulates a quicker repair process and a larger hypertrophic response. In men, the portion of white yarn is higher.

Physiologic Variants

The Tensor the the Vastus Intermedius

The tensor the the vastus intermedius can be classified right into 4 morphological types, based upon the position of the aponeurosis.

The an initial type or independent type originates indigenous the upper part of the intertrochanteric line and also the anterior portion of the good trochanter. Its origin is separated indigenous the beginning of the vastus intermedius in around 33% the the population. The fascia or aponeurosis continues to be separated native the vastus lateralis and also the vastus intermedius.
In the second form it originates together with the vastus intermedius; the aponeurosis is separable from the vastus lateralis. This morphology involves around 8% that the population.
In the 3rd type, the muscle originates native the vastus lateralis, when the aponeurosis is separable indigenous the vastus intermedius. The portion is around 30%.
The typology of kind four or common typology, originates from the vastus lateralis, v the aponeurosis separable indigenous the lateral vastus and also the vastus intermedius. The finding is about 27%.

Vastus Medialis

According to some authors, the vastus medialis can be divided into vastus medialis obliquus and vastus medialis longus, based upon the orientation that the fibers. The first portion is an ext innervated than the second portion.

Vastus Lateralis

In the literary works are not reported important transforms in the vastus lateralis. That origin and insertion continue to be constant, as research studies on cadavers confirm.

Vastus Intermedius

This part of the quadriceps muscle might exhibit variations in the insertions or origin. The may present with a smaller area that the femur or broader attachment; it deserve to involve the vastus lateralis in its origin, forming a solitary origin of the 2 vasti.

Rectus Femoris

The rectus femoris may have accessory muscles. A muscle on slide could result from the acetabulum and fit straight into the vastus lateralis. Two unique muscular districts might constitute the rectus femoris. That is origin may vary indigenous deriving indigenous the top anterior iliac spine to deriving just from the reduced anterior iliac spine in the lack of the acetabular origin. The vastus can fit straight into the vastus intermedius.

Surgical Considerations

Quadriceps Tendon Ruptures<1><2>

Distal quadriceps tendon ruptures most generally occur in patients end 40 years of age. Distal quadriceps tendon ruptures most typically occur at its insertion suggest at the superior pole that the patella and also have an incidence rate greater than the of the patellar tendon rupture counterpart.

Unless clinical comorbidities preclude the overwhelming benefits and also positive outcomes from main repair, surgical treatment is recommended. Indications because that nonoperative monitoring are limited to partial tears once the patient still has actually an intact extensor mechanism. In the latter situation, the patient have the right to be placed in a knee immobilizer or a hinged knee brace locked in extension for 2 come 3 weeks relying on the level of partial injury. ~ repeat clinical evaluation, the patience is automatically prescribed a rigorous physical treatment regimen come combat imminent knee stiffness and quadriceps atrophy. Until the patience can demonstrate adequate quadriceps muscle control, the knee brace is to be worn throughout ambulation. When the quadriceps show post-rehabilitation strength that is comparable come the contralateral extremity, the brace offer an assisting function in augmenting the dynamic security of the knee joint itself. Any injuries influence muscles, tendons, or ligaments crossing the knee share (in this case, the quadriceps functionally crosses the knee joint via the extensor mechanism and patellar tendon) have to be treated complying with the same rehabilitation clinical pearls and also parameters.

The very same rehabilitation parameters mentioned over are specific in the postoperative period following major repair. Instantly following the repair, patients are kept in a brace locked in extension for about 2 mainly and permitted to load bear as tolerated (WBAT) through bilateral crutch assistance. Physical treatment starts at this time in the postoperative period, making use of quad stimulation modalities to help mitigate lengthy atrophy. The therapist also should be functioning on wild patellar mobilization in every directions. Patellar mobility is imperative as this theatre a critical role in staying clear of knee stiffness.  maintaining the yes, really patella chin mobile as the knee remains restricted secondary to pain and also immobility during the entire recovery duration is critical in giving the patient the ideal chance of achieving the best possible outcome. At an early stage passive range of activity (ROM) is perform by the therapist, focusing on getting the knee "straight" come terminal extension, and progressively boosting flexion purposes from week come week (as defined by the surgeon). No energetic knee expansion is enabled at least for the an initial 4 weeks to safeguard the operation repair as the tendon is allowed to heal. Energetic flexion is again identified by the surgeon and starts beforehand on in the rehab process.

While individual therapy protocol will vary based on the operating surgeon, most begin more aggressive boosts in active and active-assist knee flexion purposes by week 5 when they may institute active knee expansion exercises. Aquatic treatment often enables for early energetic knee expansion protocols. Through 6 weeks, most surgeons aim because that unlocking the knee brace progressively with ambulation. This usually begins by mainly 5 or 6, v the goal of hopefully achieving ROM 0 to 120 by mainly 6 to 8 postoperatively. A 2008 research outlined ROM score parameters to 50 continuous patients through either quad or patellar tendon rupture repairs. Both teams of patient hit the 0 come 120 level ROM mark in between 7 and 8 main postoperatively. Through 12 weeks, every 50 patients accomplished knee flexion same to or within 10 levels of the contralateral typical knee.  by 6 months, 80% of patients demonstrated no evidence of any residual extensor lag.<2>

Setting patient expectations through respect come the recovery process is important. Follow to literature, restore is very slow and unsatisfactory for the patient, regardless of the operation approach. One of the causes is the pain that might persist and also the presence of scar tissue and also adherence come the tendinous tissue. This leader to an inability to completely use the quadriceps muscle and the partial ns of proprioceptive information helpful to the muscle. Patient reporting one unsatisfactory outcome is overwhelmingly secondary to one extensor lag and also knee stiffness that compromises the ability to either return to sport (at prior competition level) or return to baseline recreational task and/or ADLs.

Other surgical Considerations

Surgical ideologies in full Knee Arthroplasty (TKA)<3>

The most usual approaches because that the standard major TKA procedure incorporate the medial parapatellar, midvastus, and subvastus approaches.  while each method has theoretical benefits and disadvantages, in its entirety the literature remains controversial worrying the best as whole surgical strategy for TKA.

The medial parapatellar method is commonly utilized and entails proximal dissection through a medial cuff of the quadriceps tendon come facilitate remarkable tissue top quality closure at the conclusion the the procedure. Distally, a meticulous, consistent medial subperiosteal dissection sleeve is performed while maintaining intimacy through the proximal tibial bone. The level of dissection is frequently dictated through the anticipated amount of deformity to it is in corrected. In general, this medial release is aggressive in situations of severe varus deformity, and also most minimal in cases of center to progressed valgus knee deformity. The medial meniscus is additionally resected through this sleeve of soft tissue.

Alternatives come the standard medial parapatellar arthrotomy include the midvastus and subvastus approaches. The midvastus approach spares the quadriceps tendon. Instead, the vastus medialis obliquus (VMO) muscle belly is dissected along a trajectory directed toward the superomedial facet of the proximal pole the the patella.

The subvastus approach also spares the quadriceps tendon and lifts the muscle ship of the VMO turn off the intermuscular septum. The subvastus approach preservation the vascularity that the patella and is cautioned together it can limit exposure in particularly an overwhelming cases or specifically obese patients.

Quadriceps muscle During complete Hip Arthroplasty (THA)

Postoperatively adhering to THA, the majority of patient report a satisfactory outcome.<4> With respect come quad considerations, early rehabilitation and also progressive ambulation (including gait re-training protocols) space imperative come strengthen all of the muscles of the lower extremity. Surgically, the anterior thigh is given certain attention throughout the straight anterior method for THA.

The DA technique is becoming increasingly popular among THA surgeons. The internervous interval is in between the tensor fascia lata (TFL) and also sartorius top top the superficial end, and the gluteus medius and rectus femoris (RF) top top the deep side. DA THA advocates mention the theoretical reduced hip dislocation rates in the postoperative duration and the avoidance of the hip abbot musculature.

The disadvantages incorporate the finding out curve connected with the method as the literature documents the diminished complication prices after a operated doctor surpasses the an ext than 100-case mark. Other disadvantages incorporate increased wound symptom in particularly obese patient with huge panni (without the usage of an abdominal muscle binder), an overwhelming femoral exposure, the risk of lateral femoral cutaneous nerve (LFCN) paresthesias, and a potentially higher rate of intra-operative femur fractures. Finally, plenty of surgeons need accessibility to a devoted operating table with as necessary trained personnel and also surgical technicians to assist in the procedure. Back the latter is not constantly required, finding out to perform the procedure on a continual operating table likewise requires a considerable learning curve that must be considered.<5>

Reconstruction the Quadriceps Muscle

Sarcomas room a type of cancer the may occur in the anterior compartment that the thigh. The surgeon can choose which muscle flap to remove from the reduced limb to rebuild that component of the sectioned quadriceps muscle. The decision will depend not just on the technique of the surgeon but additionally on the size and also depth of the tumor. The prognosis of recovery of the quadriceps functions is never ever positive since strength and muscle mass room lost, and also persistent pain, scars, and adherence makes the activity of the limb more disadvantaged. 

Following trauma, the have to rebuild part of the muscle may arise. The prognosis will always be negative, through a recovery that will depend on the extent of the surgery.

Another cause of quadriceps surgical treatment is the repair of the rectus femoris. The last vastus is wealthy in white fibers and also is capable of creating much force, specifically during one eccentric contraction. In sporting activities where movements are forced such together sudden decelerations or slowing under to counteract an crucial load, the possibilities that muscle breakdown, full or parcel, increase. In those cases, wherein the patient requires sensible restoration, restoration surgery is used. The prognosis might be good, follow to the few data in the literature, yet the presence of scar and also adherence could transform the original function of the rectus femoris.

Muscle Flap

Recent literary works has shown that utilizing the quadriceps muscle flap (vastus intermedius) is reliable for reconstructing one area that the neurocranium (after trauma or resection of tumors and for aesthetic objectives). We have actually no data on the practical recovery the the quadriceps muscle.

The quadriceps muscle flap deserve to be supplied to repair the section of the gluteus medius.

During prosthetic hip implantation or a hip surgical treatment for resection that tumors or the losing of the insertion of the gluteus medius native the good trochanter, the latter muscle may be injured, compromising that is function. To protect against loss the abductive function of the hip, and in the active presence of the premium gluteal nerve, that is feasible to use a quadriceps muscle flap (generally the vastus lateralis) to produce a valuable compensation for walking.

Other basic Surgical Considerations

Any time surgical treatment is performed, one emphasis is placed upon restore process. This includes much more subtle examples, because that example, non-extremity-based surgeries like bariatric surgery. Bariatric surgery, for example, gastric bypass, although the may enhance physical role in general, involves a ns of mass and also strength of the quadriceps muscles. This way a lose of coordination between the various vasti with rise in feasible patient falls. Muscle recovery (mass and strength) need to be taken into consideration in this form of patient.

More apparent scenarios include any type of lower extreme surgery, including the surgeries discussed above, but likewise arthroscopic steps such together  anterior cruciate ligament (ACL) or posterior cruciate ligament (PCL) reconstruction.

ACL Reconstruction

Following ACL reconstruction, recovery to the original duty is very slow, and also it is not always possible to entirely recover the contractile function. Fifty percent of the athletes that undergo surgery execute not go back to previous performance levels; the the latter, about 20% to 30% will certainly resort come a second operation or develop osteoarthritis difficulties over a period of 10 years.

Several rehabilitative viewpoints are offered to restore the duty of the quadriceps, however they are not always effective, such together isokinetic, electrostimulation, or exercises that shot to segment the occupational on every vastus muscle.

In reality, that is important to carry out exercises the reflect the functions of the muscle, both as a selection of activities (movements qualified of exhaustively exploiting shortening and full elongation) and also as a normal neuromotor intervention (athletic gesture or day-to-day gesture, without non-physiological stimuli such together isokinetic or electrostimulation).

Furthermore, the various metabolic framework of the muscle have to be considered, such as red fibers and also white fibers. For the recovery of strength, coordination, and muscle mass, one should encompass strength maintain exercises; while for aerobic metabolism and also endurance exercises, one does not exclude the other.

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PCL Reconstruction

After the surgical reconstruction of the posterior cruciate ligament, the sensible recovery that the quadriceps is faster, although there is incomplete restore of strength and also muscle mass. One concept is that the proprioceptive afferents that the injured anterior cruciate ligament space not able to send adequate info to the main nervous system compared to the posterior ligament. Probably, there would certainly be a greater receptor complexity for the anterior ligament in relationship to the duty of the quadriceps muscle.