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Stylohyoid muscle

Muscle in the neck

Summary

Muscle in the neck

Field	Value
Name	Stylohyoid
Latin	musculus stylohyoideus
Image	Musculi colli stylohyoideus.svg
Caption	The stylohyoid among the triangles of the neck.
Image2	Stylohyoid muscle.PNG
Caption2	Muscles of the neck. Anterior view. Stylohyoid muscle in purple
Origin	Styloid process (temporal)
Insertion	Greater cornu of hyoid bone
Nerve	Facial nerve (CN VII)
Action	Elevate the hyoid during swallowing

The stylohyoid muscle is one of the suprahyoid muscles. Its originates from the styloid process of the temporal bone; it inserts onto hyoid bone. It is innervated by a branch of the facial nerve. It acts draw the hyoid bone upwards and backwards.

Structure

The stylohyoid is a slender muscle. It is directed inferoanteriorly from its origin towards its insertion.

It is perforated near its insertion by the intermediate tendon of the digastric muscle.

Origin

The muscle arises from the posterior surface of the temporal styloid process; it arises near the base of the process. It arises by a small tendon of origin.

Insertion

The muscle inserts onto the body of hyoid bone at the junction of the body and greater cornu.

It passes anterior to the intermediate tendon of the digastric muscle and is inserted immediately superior to that of the superior belly of omohyoid muscle.

Vasculature

The stylohyoid muscle receives arterial supply branches of the facial artery, posterior auricular artery, and occipital artery.

Innervation

The stylohyoid muscle receives motor innervation from the stylohyoid branch of facial nerve (CN VII).

Relations

The muscle is situated anterosuperior to the posterior belly of the digastric muscle.

Variation

It may be absent or doubled. It may be situated medial to the carotid artery. It may insert suprahyoid muscles of infrahyoid muscles.

Actions/movements

The stylohyoid muscle elevates and retracts the hyoid bone (i.e. draws it superiorly and posteriorly).

Function

The stylohyoid muscle elongates the floor of the mouth. It initiates a swallowing.

Additional images

File:Gray137.png|Left temporal bone. Outer surface. File:Gray186.png|Hyoid bone. Anterior surface. Enlarged. File:Gray507.png|Superficial dissection of the right side of the neck, showing the carotid and subclavian arteries. File:Stylohyoideus.png|Extrinsic muscles of the tongue. Left side. File:Slide6aaa.JPG|Stylohyoid muscle File:Slide18aaa.JPG|Stylohyoid muscle

References

Chokroverty, Sudhansu. (2009-01-01). "Chapter 7 - Physiologic Changes in Sleep". W.B. Saunders.
Rea, Paul. (2016-01-01). "Chapter 2 - Head". Academic Press.
Standring, Susan. (2020). "Gray's Anatomy: The Anatomical Basis of Clinical Practice".

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

facial-muscles suprahyoid-muscles muscles-of-the-head-and-neck otorhinolaryngology

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