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Infrahyoid muscles: want to learn more about it?

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Infrahyoid muscles

The infrahyoid muscles are a group of four muscles under the hyoid bone attaching to the sternum, larynx and scapula.

Anatomy

Omohyoid muscle

The omohyoid muscle is divided into a superior and inferior belly. The inferior belly begins at the superior border of scapula, ascends craniomedially and merges into an intermediate tendon at the height of the lateral cervical region. This tendon is connected to the carotid sheath which surrounds the neurovascular bundle (including the common carotid artery, internal jugular vein and vagus nerve). Distally the muscle attaches to the body of hyoid.

Sternothyroid muscle

The sternothyroid muscle originates from the dorsal surface of the manubrium and inserts on the oblique line of thyroid cartilage. That is why the sternothyroid is the only hyoid muscle that does not directly attach to the hyoid bone. The sternothyroid lies in close relation to the capsule of the thyroid gland.

Thyrohyoid muscle

The thyrohyoid muscle constitutes the continuation of the sternothyroid, beginning at the oblique line of thyroid cartilage and inserting on the body of hyoid and greater cornu.

Sternohyoid muscle

The sternohyoid muscle has its origin at the dorsal surface of manubrium and the sternoclavicular joint and its insertion on the body of hyoid. The sternohyoid is the most superficial of all the infrahyoid muscles.

Innervation

The omohyoid, sternothyroid and sternohyoid muscles are supplied by the deep ansa cervicalis (C1-C3), which arises from the cervical plexus. Thyrohyoid, unlike the other infrahyoid muscles, is not innervated by the ansa cervicalis. Instead, nerve fibers from the anterior rami of the first cervical spinal nerve (C1) reach the muscle via the hypoglossal nerve (CN XII)

Function

The infrahyoid muscles are responsible for the positioning of the hyoid bone along with the suprahyoid muscles. They play an active role in swallowing and the movement of the larynx. More specifically, all infrahyoid muscles (except the sternothyroid) depress the hyoid. The sternothyroid depresses the larynx whereas the thyrohyoid elevates it (when the hyoid bone is fixed). The omohyoid has an additional function due to its attachment to the carotid sheath: by pulling the sheath, it maintains a low pressure in the internal jugular vein, this way increasing the blood return from the head to the superior vena cava.

Infrahyoid muscles: 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.

What do you prefer to learn with?

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

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