Sternothyroid muscle

The sternothyroid muscle, or sternothyroideus, is an infrahyoid muscle in the neck.[1] It acts to depress the hyoid bone.[2] It is below the sternohyoid muscle. It is shorter and wider than the sternohyoid.

Sternothyroid muscle
Sternothyroid visible center left
Section of the neck at about the level of the sixth cervical vertebra. Showing the arrangement of the fascia coli. (Sternothyroideus labeled at right, third from top.)
Details
OriginManubrium
InsertionThyroid cartilage
ArterySuperior thyroid artery
NerveAnsa cervicalis
ActionsDepresses thyroid cartilage
Identifiers
LatinMusculus sternothyroideus
TA98A04.2.04.006
TA22173
FMA13343
Anatomical terms of muscle

Structure

The sternothyroid arises from the posterior surface of the manubrium of the sternum, below the origin of the sternohyoid.[3] It also arises from the edge of the cartilage of the first rib. It is inserted into the oblique line on the lamina of the thyroid cartilage. It is in close contact with its fellow at the lower part of the neck, but diverges somewhat as it ascends. It is occasionally traversed by a transverse or oblique tendinous inscription.

Innervation

The sternothyroid muscle is innervated by the ansa cervicalis.[4][5]

Variations

Doubling; absence; accessory slips to the thyrohyoid, inferior pharyngeal constrictor, or to the carotid sheath.

Function

The sternothyroid muscle depresses the hyoid bone, along with the other infrahyoid muscle.[2]

Clinical significance

The upward extension of a thyroid swelling (goitre) is prevented by the attachment of the sternothyroid to the thyroid cartilage. A goitre can therefore only grow to the front, back or middle but no higher.

Additional images
  • Superficial dissection of the right side of the neck, showing the carotid and subclavian arteries.
  • The fascia and middle thyroid veins.
  • Hypoglossal nerve, cervical plexus, and their branches.
  • Side view of the larynx, showing muscular attachments.
  • Sternothyroid muscle

References

This article incorporates text in the public domain from page 393 of the 20th edition of Gray's Anatomy (1918)

  1. Chokroverty, Sudhansu (2009-01-01), Chokroverty, Sudhansu (ed.), "Chapter 7 - Physiologic Changes in Sleep", Sleep Disorders Medicine (Third Edition), Philadelphia: W.B. Saunders, pp. 80–104, doi:10.1016/b978-0-7506-7584-0.00007-0, ISBN 978-0-7506-7584-0, retrieved 2020-11-25
  2. Derksen, Frederik J. (2006-01-01), Auer, Jörg A.; Stick, John A. (eds.), "Chapter 40 - Overview of Upper Airway Function", Equine Surgery (Third Edition), Saint Louis: W.B. Saunders, pp. 516–522, doi:10.1016/b1-41-600123-9/50042-5, ISBN 978-1-4160-0123-2, retrieved 2020-11-25
  3. Fessler, Richard G.; Kim, Daniel H. (2012-01-01), Quiñones-Hinojosa, Alfredo (ed.), "Chapter 191 - Surgical Approaches to the Cervicothoracic Junction", Schmidek and Sweet Operative Neurosurgical Techniques (Sixth Edition), Philadelphia: W.B. Saunders, pp. 2177–2191, doi:10.1016/b978-1-4160-6839-6.10191-1, ISBN 978-1-4160-6839-6, retrieved 2020-11-25
  4. McHanwell, Steve; Watson, Charles (2009-01-01), Watson, Charles; Paxinos, George; Kayalioglu, Gulgun (eds.), "Chapter 7 - Localization of Motoneurons in the Spinal Cord", The Spinal Cord, San Diego: Academic Press, pp. 94–114, doi:10.1016/b978-0-12-374247-6.50011-0, ISBN 978-0-12-374247-6, retrieved 2020-11-25
  5. Cesmebasi, Alper (2015-01-01), Tubbs, R. Shane; Rizk, Elias; Shoja, Mohammadali M.; Loukas, Marios (eds.), "Chapter 31 - Anatomy of the Cervical Plexus and Its Branches", Nerves and Nerve Injuries, San Diego: Academic Press, pp. 441–449, doi:10.1016/b978-0-12-410390-0.00032-9, ISBN 978-0-12-410390-0, retrieved 2020-11-25
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