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Sternohyoid muscle: want to learn more about it?

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Sternohyoid muscle

Sternohyoid muscle (Musculus sternohyoideus)

Sternohyoid muscle is a strap like infrahyoid muscle that connects the hyoid bone with the clavicle and sternum

Along with the omohyoid muscle, it comprises the superficial plane of infrahyoid muscles, while the sternothyroid and thyrohyoid belong to the deep layer. The function of this muscle is to reestablish the breathing process by pulling the hyoid bone and larynx inferiorly after deglutition.

This article will discuss the anatomy of the sternohyoid muscle.

Key facts about the sternohyoid muscle
Origin Manubrium of sternum, medial end of clavicle
Insertion Inferior border of body of hyoid bone
Action Anterior rami of spinal nerves C1-C3 (via ansa cervicalis)
Innervation Depresses hyoid bone (from elevated position)
Blood supply Superior thyroid artery
Recommended video: Sternohyoid muscle
Origins, insertions, innervation and functions of the sternohyoid muscle.

Origin and insertion

Sternohyoid muscle originates from the upper posterior aspect of manubrium of sternum and the posterior surface of the medial end of clavicle .

It extends superomedially and inserts to the inferior border of body of hyoid bone, where it adjoins the insertion of the contralateral sternohyoid muscle.

Relations

Same as other three infrahyoid muscles, the sternohyoid muscle is contained within the muscular triangle of the neck, a subdivision of the anterior triangle. The superior part of the muscle lies very close to its contralateral fellow while below the middle of their course, there is a considerable gap between them.

It lies posteriorly to the platysma and anteriorly to the larynx, the thymus (or thymic remnants) and the thyrohyoid and sternothyroid muscles. The sternohyoid (together with the sternothyroid, separates the anterior jugular vein (superficially) from the common carotid artery (deeply).

Learn more about the infrahyoid muscles here.

Innervation

Sternohyoid muscle is innervated by ansa cervicalis, a loop formed by the anterior rami of spinal nerves C1-C3 within the cervical plexus.

Blood supply

Vascular supply to sternohyoid comes from the superior thyroid artery (a branch of the external carotid artery), while the venous blood is conveyed by the superior thyroid vein.

Function

The action of the sternohyoid muscle is to depress the hyoid bone after it has been elevated by the suprahyoid muscles. The elevation of the hyoid bone and thus the larynx, happens during swallowing. This action closes the airways, preventing the food from being inhaled.

Once the food pass from the pharynx to esophagus, the sternohyoid muscle aids to reopening the laryngeal inlet by depressing the hyoid bone and larynx, thus reinstating the breathing process.

Sternohyoid muscle: want to learn more about it?

Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster.

Sign up for your free Kenhub account today and join over 1,206,283 successful anatomy students.

“I would honestly say that Kenhub cut my study time in half.” – Read more. Kim Bengochea Kim Bengochea, Regis University, Denver

Show references

References

  • Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2014). Clinically Oriented Anatomy (7th ed.). Philadelphia, PA: Lippincott Williams & Wilkins.
  • Palastanga, N., & Soames, R. (2012). Anatomy and human movement: structure and function (6th ed.). Edinburgh: Churchill Livingstone.
  • Standring, S. (2016). Gray's Anatomy (41tst ed.). Edinburgh: Elsevier Churchill Livingstone.

Author, review and layout:

  • Jana Vaskovic
  • Dimitrios Mytilinaios
  • Abdulmalek Albakkar

Illustrators:

  • Sternohyoid muscle (Musculus sternohyoideus) - Yousun Koh
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