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Sternohyoid muscle

Dr Craig Hacking ◉ ◈ and Dr Chamath Ariyasinghe et al.

The sternohyoid muscle is an infrahyoid muscle of the neck that is innervated by the ansa cervicalis of the cervical plexus receiving fibers from the ventral rami of C1-C3 spinal nerves. The sternohyoid is a paired, flat strap of muscle that serves to fix the hyoid bone as well as depressing the larynx in phonation and in the terminal phase of swallowing.

On this page:

Article:

Summary
Gross anatomy
Action
Related articles
References

Images:

Cases and figures

Summary

origin: posterior surface of manubrium sterni and the sternoclavicular joint
insertion: lower body of the hyoid bone
innervation: anterior rami of C1-C3 spinal nerves through the ansa cervicalis of the cervical plexus
action:
- depresses and fixes the hyoid bone
- draws the hyoid bone and underlying larynx downwards in phonation and the terminal phase of swallowing

Gross anatomy

Origin

The sternohyoid muscles are paired muscles that originate from the upper posterior surface of the manubrium and sternoclavicular joints.

Insertion

The muscles travel vertically to insert on the lower border of the hyoid bone. At their insertion on the hyoid bone the sternohyoid muscles lie edge-to-edge however diverge around the laryngeal prominence (Adam’s apple), which protrudes between them.

Relations

The sternohyoid muscle is one of the infrahyoid “strap” muscles. It is superficial to the sternothyroid and thyrohyoid muscles and inserts just medially to the superior belly of the omohyoid bone on the inferior border of the hyoid bone.

Blood supply

The sternohyoid muscle receives its blood supply from the lingual and superior thyroid arteries.

Nerve supply

The sternohyoid muscles are innervated by the anterior rami of C1 – C3 (predominantly C2 and C3) through the ansa cervicalis of the cervical plexus.

Action

The sternohyoid muscle primarily depresses and fixes the hyoid bone and underlying larynx. Electromyographic studies have also demonstrated the muscle is involved in phonation by depressing the hyoid bone and underlying larynx.

References

Anatomy: Head and neck

Article information

rID: 38276

System: Head & Neck

Section: Anatomy

Synonyms or Alternate Spellings:

Sternohyoid muscles

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Cases and figures

Figure 1: nerve to sternohyoid Figure 1: nerve to sternohyoid

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Figure 2: cervical plexus labeled Figure 2: cervical plexus labeled

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