Thyrohyoid muscle

The thyrohyoid muscle is a small skeletal muscle on the neck which depresses the hyoid and elevates the larynx.

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 larynx
InsertionHyoid bone
ArterySuperior thyroid artery
NerveFirst cervical nerve (C1) via hypoglossal nerve
ActionsElevates thyroid and depresses the hyoid bone
Identifiers
LatinMusculus thyrohyoideus
TAA04.2.04.007
FMA13344
Anatomical terms of muscle

This quadrilateral muscle appearing like an upward continuation of the sternothyreoideus. It belongs to the infrahyoid muscles group.

It arises from the oblique line on the lamina of the thyroid cartilage, and is inserted into the lower border of the greater cornu of the hyoid bone.

It is innervated by thyrohyoid branch of C1 nerve. This nerve branches from the first cervical nerve as it joins the hypoglossal nerve (12th Cranial Nerve) for a short distance. This is the only exception in the infrahyoid muscles, or strap muscles, that is not innervated by ansa cervicalis[1].

Additional images
  • Hyoid bone. Anterior surface. Enlarged.
  • The veins of the thyroid gland.
  • Hypoglossal nerve, cervical plexus, and their branches.
  • The right brachial plexus with its short branches, viewed from in front.
  • Side view of the larynx, showing muscular attachments.
  • Thyrohyoid muscle
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See also

References

This article incorporates text in the public domain from page 394 of the 20th edition of Gray's Anatomy (1918)

  1. Netter, Frank H. (2018). Atlas of Human Anatomy. Elsevier. pp. Table 2.9. ISBN 9780323393218.


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