The musculus uvulae[1] (also muscle of uvula, uvular muscle, or palatouvularis muscle[2]) is a bilaterally muscle of the soft palate (one of five such muscles) that acts to shorten the uvula when both muscles contract.[3] It forms most of the mass of the uvula.[2] It is innervated by the pharyngeal plexus of vagus nerve (cranial nerve X).[3][4]
Anatomy
The muscle is situated in between the two laminae of the palatine aponeurosis. From its origin, it passes posterior-ward superior to the swing that is formed by the levator veli palatini muscle. The musculus uvulae and levator veli palatini muscle form a right angle so that their contraction elevates the levator eminence to aid in separating the oral cavity and the oropharynx.[4]
Origin
The muscle arises from the posterior nasal spine of the palatine bone, and the (superior aspect of the[4]) palatine aponeurosis.[3][4]
Insertion
The muscle inserts into the mucous membrane of the uvula.[3][4]
Vasculature
The muscle receives arterial blood from the ascending palatine artery, and the descending palatine artery.[4]
Actions/movements
Bilateral contraction of the two muscles shortens the uvula.[3] It also elevates[2] and retracts[4] the uvula.
Unilateral contraction draws the uvula ipsilaterally.[3]
Function
By retracting the uvula and thickening the middle portion of the soft palate, the muscle assist the levator veli palatini in separating the oral cavity and the oropharynx.[4]
References
- ^ a b "Anatonomina". www.terminologia-anatomica.org. Retrieved 2023-07-17.
- ^ a b c d e f "Musculus uvulae muscle". TheFreeDictionary.com. Retrieved 2023-07-17.
- ^ a b c d e f Helwany, Muhammad; Rathee, Manu (2023), "Anatomy, Head and Neck, Palate", StatPearls, Treasure Island (FL): StatPearls Publishing, PMID 32491749, retrieved 2023-07-17
- ^ a b c d e f g h Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York. pp. 710–711. ISBN 978-0-7020-7707-4. OCLC 1201341621.
{{cite book}}: CS1 maint: location missing publisher (link)
