Palatoglossus muscle

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Palatoglossus muscle
Gray1014.png
The mouth cavity seen from anterior view. The palatoglossus muscle is beneath the glossopalatine arch (labeled at upper right)
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Dissection of the muscles of the palate from behind. (palatoglossus muscle not labeled)
Latin Musculus palatoglossus
Gray's p.1139
Origin Palatine aponeurosis
Insertion Tongue
Nerve Vagus nerve (via pharyngeal branch to pharyngeal plexus)
Actions Raising the back part of the tongue
Anatomical terms of muscle

The palatoglossus, glossopalatinus, or palatoglossal muscle is a small fleshy fasciculus, narrower in the middle than at either end, forming, with the mucous membrane covering its surface, the glossopalatine arch.

Structure[edit]

The palatoglossus arises from the anterior surface of the soft palate, where it is continuous with the muscle of the opposite side, and passing downward, forward, and lateralward in front of the palatine tonsil, is inserted into the side of the tongue, some of its fibers spreading over the dorsum, and others passing deeply into the substance of the organ to intermingle with the transverse muscle of tongue.

Innervation[edit]

The palatoglossus is the only muscle of the tongue that is not innervated by the hypoglossal nerve (CN XII). It is innervated by the vagus nerve (CN X)

Variation[edit]

But some sources state that the palatoglossus is innervated by fibres from the cranial part of the accessory nerve (CN XI) that travel via the pharyngeal plexus.[1]

Other sources state that the palatoglossus is not innervated by XI hitchhiking on X, but rather it is innervated by X via the pharyngeal plexus formed from IX and X.[2]

Function[edit]

Elevates posterior tongue, closes the oropharyngeal isthmus, and aids initiation of swallowing. This muscle also prevents the spill of saliva from vestibule into the oropharynx by maintaining the palatoglossal arch.

References[edit]

This article incorporates text from a public domain edition of Gray's Anatomy.

  1. ^ Section 3, Chapter 35 - Neck and Upper Aerodigestive Tract - Pharynx. In: Standring, S, editors. Gray's Anatomy: The Anatomical Basis of Clinical Practice, 39th Edition. London: Elsevier; 2008. p628
  2. ^ Chapter 8 Head and Neck. In: Drake RL, Vogl W, Mitchell AWM, editors. Gray's Anatomy for Students. London: Elsevier; 2005. p991

External links[edit]