The Infrahyoid muscles

June 15, 2012 | By | Reply More

The Infrahyoid muscles

They lie over

  •    the thyroid gland
  •    the trachea
  •    and the larynx

Consist of 4 muscles

  • Thyrohyoid muscle
  • Omohyoid muscle
  • Sternohyoid muscle
  • Sternothyroid

Arranged into 2 layers

1-The superficial layer

2-The deep layer

The superficial layer
Sternohyoid muscle

is a thin, narrow muscle attaching the hyoid bone to the sternum, serving to depress the hyoid bone. It is innervated by the ansa cervicalis.

The muscle arises from the posterior border of the medial end of the clavicle, the posterior sternoclavicular ligament, and the upper and posterior part of the manubrium sterni.Passing upward and medially, it is inserted by short tendinous fibers into the lower border of the body of the hyoid bone

Omohyoid muscle

Long, narrow 2 bellied muscle

Located on the anterolateral surface of the neck

Inferior belly originates from the upper horn of the hyoid

Prevents the neck region from collapsing during deep inspiration

Prevents blood vessels of the neck from being compressed

The deep layer

Sternothyroid muscle

  • each one covers its corresponding lobe of the thyroid gland
  • back of manubrium: oblique line of thyroid cartilage

Thyrohyoid muscle

is a small, quadrilateral muscle appearing like an upward continuation of the Sternothyroid. It belongs to the infra-hyoid muscles group.

It arises from the oblique line on the lamina of the thyroid cartilage, and is inserted into the lower border of the greater cornu of the hyoid bone.


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Category: Anatomy, Medical

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