Author: Jana Vasković•Reviewer: Nicola McLaren MScLast reviewed: September 30, 2021Reading time: 3 minutes
Levator labii superioris is a short, paired triangular muscle of the face. The belongs come the buccolabial group of muscles of face expression. This is a vast group of muscles, that besides levator labii superioris also contains levator labii superioris alaeque nasi, zygomaticus major, zygomaticus minor, levator anguli oris, risorius, depressor labii inferioris, depressor anguli oris, mentalis, orbicularis oris, incisivus superior and inferior, and also buccinator muscles.
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Buccolabial muscles work in synergy to regulate the shape, posture and movements of the lips. Levator labii superioris contributes to the by elevating the upper lip and also thus exposing the maxillary teeth. By performing this action, the muscle helps to develop various facial expressions, such together smiling or disdain.
|Origin||Zygomatic procedure of maxilla, maxillary process of zygomatic bone|
|Insertion||Blends through muscles of upper lip|
|Action||Elevates upper lip, exposes maxillary teeth|
|Innervation||Zygomatic and also buccal branches of face nerve (CN VII)|
|Blood supply||Facial artery, infraorbital branch the maxillary artery|
This write-up will talk about the anatomy and role of levator labii superioris muscle.
Origin and also insertion
Levator labii superioris originates from the zygomatic procedure of maxilla and also maxillary procedure of zygomatic bone, just superior to the infraorbital foramen. It courses inferomedially in the direction of the upper lip, slowly tapering and also becoming triangular in shape. It inserts in between the levator labii superioris alaeque nasi, orbicularis oris and also zygomaticus young by blending with the muscle of the upper lip.
Levator labii superioris fills the bottom the a triangular room bounded laterally through the zygomaticus minor and also medially by the levator labii superioris alaeque nasi. Lateral and also deep to levator labii superioris is the levator anguli oris. These two muscles bound a narrow interval called the infraorbital tissue an are (canine space). This room is clinically far-ranging as it is a predilection website for spreading odontogenic infections.
Levator labii superioris is innervated through the zygomatic and also buccal branches of facial nerve (CN VII).
Vascular supply to this muscle is provided by the facial artery and infraorbital branch of maxillary artery.
Together v zygomaticus minor and also levator labii superioris alaeque nasi, this muscle is a direct tractor that the top lip. This way that the inserts come the lip directly, therefore acting upon it without the use of one intermediary. By contracting, levator labii superioris helps other buccolabial muscles to elevate and also invert the upper lip. This action exposes the maxillary teeth and deepens the nasolabial lines, which has an important function in several facial expressions; smiling, smugness and also contempt.
References:Brennan, P. A., Mahadevan, V., & Evans, B. T. (2016). Clinical head and also neck anatomy because that surgeons. Boca Raton, FL: CRC Press, Taylor & Francis GroupHiatt, J. L., & Gartner, L. P. (2010). Textbook the head and neck anatomy (4th ed.). Philadelphia, PA: Lippincott Williams & Wilkins.Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2014). Clinically Oriented Anatomy (7th ed.). Philadelphia, PA: Lippincott Williams & Wilkins.Netter, F. (2019). Atlas of human being Anatomy (7th ed.). Philadelphia, PA: Saunders.Palastanga, N., & Soames, R. (2012). Anatomy and also human movement: framework and duty (6th ed.). Edinburgh: Churchill Livingstone.Standring, S. (2016). Gray"s Anatomy (41tst ed.). Edinburgh: Elsevier Churchill Livingstone.
Illustrations:Levator labii superioris muscle (Musculus levator labii superioris) - Yousun Koh
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