| Thyrohyoid muscle | |
|---|---|
 Muscles of the neck. Lateral view. (Thyrohyoideus labeled center-left.) | |
 Muscles of the neck. Anterior view. (Thyrohyoideus visible center-left.) | |
| Details | |
| Origin | Thyroid cartilage of thelarynx |
| Insertion | Hyoid bone |
| Artery | Superior thyroid artery |
| Nerve | Firstcervical nerve (C1) viahypoglossal nerve |
| Actions | Elevatesthyroid and depresses thehyoid bone |
| Identifiers | |
| Latin | musculus thyrohyoideus |
| TA98 | A04.2.04.007 |
| TA2 | 2174 |
| FMA | 13344 |
| Anatomical terms of muscle | |
Thethyrohyoid muscle is a smallskeletal muscle of theneck. Above, it attaches onto thegreater cornu of thehyoid bone; below, it attaches onto theoblique line of the thyroid cartilage. It is innervated by fibres derived from thecervical spinal nerve 1 that run with thehypoglossal nerve (CN XII) to reach this muscle. The thyrohyoid muscle depresses thehyoid bone and elevates thelarynx during swallowing. By controlling the position and shape of the larynx, it aids in making sound.
The thyrohyoid muscle is a small,[1] broad and short muscle.[2] It isquadrilateral in shape.[1] It may be considered a superior-ward continuation ofsternothyroid muscle.[1]
It belongs to theinfrahyoid muscles group and the outer laryngeal muscle group.[3]: 567–568
Its superior attachment[note 1][1] is the inferior border[1] of thegreater cornu of thehyoid bone[2][1][3]: 538 and adjacent portions of thebody of hyoid bone.[1]
Its inferior attachment[note 2][1] is theoblique line of the thyroid cartilage (alongside thesternothyroid muscle[1]).[2][1][3]: 538
The thyrohyoid muscle is innervated (along with thegeniohyoid muscle[1][3]: 457, 709 ) by a branch of thecervical plexus[4][3]: 538 - thenerve to thyrohyoid muscle (thyrohyoid branch of ansa cervicalis)[4] - which is formed by fibres of thecervical spinal nerve 1 (C1)[1][2][3]: 538 (and - according to some sources -cervical spinal nerve 2 as well[4][3]: 457 ) that join and travel with thehypoglossal nerve (CN XII)[2] before splitting away from it[1][2] distal to thesuperior root of ansa cervicalis.[1][3]: 709 The thyrohyoid muscle is the only infrahyoid muscle that is not innervated via theansa cervicalis.[1]
The muscle is provided with arterial blood by branches of thesuperior thyroid artery, and of thelingual artery.[1]
The thyrohyoid muscle forms the inferior boundary of thecarotid triangle.[5] It is situated deep to (beneath) the (depending upon the source) superior portion of[2]/superior belly of[3]: 538 thesternohyoid muscle,[2][3]: 538 and the superior portion of[2] theomohyoid muscle.[2][3]: 538
The thyrohyoid muscle depresses and fixates thehyoid bone. It elevates thelarynx during swallowing.[3]: 538 By controlling the position and shape of the larynx, it aids in making sound.[6]
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This article incorporates text in thepublic domain frompage 394 of the 20th edition ofGray's Anatomy(1918)
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