Thyrohyoid muscle (Redirected from Thyrohyoid)

Thyrohyoid muscle
Muscles of the neck. Lateral view. (Thyrohyoideus labeled center-left.)
Muscles of the neck. Anterior view. (Thyrohyoideus visible center-left.)
Details
Originthyroid cartilage of the larynx
Insertionhyoid bone
Arterysuperior thyroid artery
Nervefirst cervical nerve (C1) via hypoglossal nerve
Actionselevates thyroid and depresses the hyoid bone
Identifiers
Latinmusculus thyrohyoideus
TA98A04.2.04.007
TA22174
FMA13344
Anatomical terms of muscle

The thyrohyoid muscle is a small skeletal muscle of the neck. Above, it attaches onto the greater cornu of the hyoid bone; below, it attaches onto the oblique line of the thyroid cartilage. It is innervated by fibres derived from the cervical spinal nerve 1 that run with the hypoglossal nerve (CN XII) to reach this muscle. The thyrohyoid muscle depresses the hyoid bone and elevates the larynx during swallowing. By controlling the position and shape of the larynx, it aids in making sound.

Structure

The thyrohyoid muscle is a small, broad and short muscle. It is quadrilateral in shape. It may be considered a superior-ward continuation of sternothyroid muscle.

It belongs to the infrahyoid muscles group and the outer laryngeal muscle group.: 567–568 

Attachments

Its superior attachment is the inferior border of the greater cornu of the hyoid bone: 538  and adjacent portions of the body of hyoid bone.

Its inferior attachment is the oblique line of the thyroid cartilage (alongside the sternothyroid muscle).: 538 

Innervation

The thyrohyoid muscle is innervated (along with the geniohyoid muscle: 457, 709 ) by a branch of the cervical plexus: 538  - the nerve to thyrohyoid muscle (thyrohyoid branch of ansa cervicalis) - which is formed by fibres of the cervical spinal nerve 1 (C1): 538  (and - according to some sources - cervical spinal nerve 2 as well: 457 ) that join and travel with the hypoglossal nerve (CN XII) before splitting away from it distal to the superior root of ansa cervicalis.: 709  The thyrohyoid muscle is the only infrahyoid muscle that is not innervated via the ansa cervicalis.

Blood supply

The muscle is provided with arterial blood by branches of the superior thyroid artery, and of the lingual artery.

Relations

The thyrohyoid muscle forms the inferior boundary of the carotid triangle. It is situated deep to (beneath) the (depending upon the source) superior portion of/superior belly of: 538  the sternohyoid muscle,: 538  and the superior portion of the omohyoid muscle.: 538 

Function

The thyrohyoid muscle depresses and fixates the hyoid bone. It elevates the larynx during swallowing.: 538  By controlling the position and shape of the larynx, it aids in making sound.

Additional images

See also


This page was last updated at 2024-04-18 12:54 UTC. Update now. View original page.

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