Palatopharyngeus muscle

Muscle infobox
Name = Palatopharyngeus muscle
Latin = musculus palatopharyngeus
GraySubject = 243
GrayPage = 1139


Caption = Dissection of the muscles of the palate from behind. (Pharyngopalatinus labeled at top center, below choanae.)
Origin = palatine aponeurosis and hard palate
Insertion = Upper border of thyroid cartilage (blends with constrictor fibers)
Blood = Facial artery
Nerve = vagus nerve and cranial accessory nerve
Action = pulls pharynx and larynx
MeshName =
MeshNumber =
DorlandsPre = m_22
DorlandsSuf = 12550054
The palatopharyngeus or palatopharyngeal or pharyngopalatinus muscle is a long, fleshy fasciculus, narrower in the middle than at either end, forming, with the mucous membrane covering its surface, the palatopharyngeal arch.

Origin and insertion

It is separated from the palatoglossus muscle by an angular interval, in which the palatine tonsil is lodged. It arises from the soft palate, where it is divided into two fasciculi by the levator veli palatini and musculus uvulae.

* The "posterior fasciculus" lies in contact with the mucous membrane, and joins with that of the opposite muscle in the middle line.
* The "anterior fasciculus", the thicker, lies in the soft palate between the levator and tensor veli palatini muscles, and joins in the middle line the corresponding part of the opposite muscle.

Passing lateralward and downward behind the palatine tonsil, the palatopharyngeus joins the stylopharyngeus and is inserted with that muscle into the posterior border of the thyroid cartilage, some of its fibers being lost on the side of the pharynx and others passing across the middle line posteriorly to decussate with the muscle of the opposite side.

Action

The palatine velum is slightly raised by the levator veli palatini and made tense by the tensor veli palatini; the palatopharyngeus muscles, by their contraction, pull the pharynx upward over the bolus of food and nearly come together, the uvula filling up the slight interval between them.

By these means the bolus is prevented from passing into the nasal part of the pharynx; at the same time, the palatopharyngeus muscles form an inclined plane, directed obliquely downward and backward, along the under surface of which the bolus descends into the lower part of the pharynx.

External links

*
*
*
*
*