Infrahyoid Muscles Anatomy

Which group of muscles are located inferiorly to the hyoid bone?

How many muscle bellies is the omohyoid comprised of?

Which muscle arises from the scapula and runs underneath the sternocleidomastoid muscle?

To which bone does the superior belly of the omohyoid muscle attach?

What is the action of the sternohyoid muscle?

Which arteries supply the infrahyoid muscles?

What innervates the omohyoid muscle?

Which muscle is wider and deeper than the sternohyoid?

What is the innervation of the sternothyroid muscle?

Which structure anchors the intermediate tendon of the omohyoid muscle to the clavicle?

Where does the superior belly of the omohyoid muscle attach?

Which arteries supply the arterial blood to the infrahyoid muscles?

What is the action of the thyrohyoid muscle?

Which muscle in the infrahyoid group is wider and deeper than the sternohyoid?

What is the innervation of the omohyoid muscle?

Where does the intermediate tendon of the omohyoid muscle anchor?

Which arteries supply the arterial blood to the infrahyoid muscles?

What is the action of the thyrohyoid muscle?

Infrahyoid muscles are located inferiorly to the hyoid bone.
The omohyoid muscle consists of two muscle bellies: a superior belly and an inferior belly.
The omohyoid muscle arises from the scapula and runs underneath the sternocleidomastoid muscle.
The superior belly of the omohyoid muscle attaches to the hyoid bone.

Actions of the Infrahyoid Muscles

The sternohyoid muscle primarily functions to depress the hyoid bone.
The thyrohyoid muscle also functions to depress the hyoid but can elevate the thyroid cartilage.

Blood Supply and Innervation

The infrahyoid muscles receive arterial supply from the superior thyroid and thyrocervical trunk.
The omohyoid muscle is innervated by the superior root of the ansa cervicalis (C1-C3).
The sternothyroid muscle is innervated by the ansa cervicalis.

Muscle Characteristics

The sternothyroid muscle is wider and deeper compared to the sternohyoid muscle.
The intermediate tendon of the omohyoid muscle is anchored to the clavicle by fibrous tissue connecting to the surrounding fascia.

Muscle Attachments

The superior belly of the omohyoid muscle attaches to the body of the hyoid bone.
The intermediate tendon anchors the omohyoid muscle, providing structural stability during movement.

Test your knowledge on the anatomy of the infrahyoid muscles located inferiorly to the hyoid bone in the neck. Learn about the two groups of infrahyoid muscles, arterial supply, and venous drainage.