Infrahyoid Muscles

Question 1

What muscle depresses larynx and hyoid bone, when mandible is fixed? (Superficial except to SCM)

Answer 1

Sternohyoid, originating from manubrium & medial end of clavicle to lower margin of hyoid bone.

Question 2

What muscle depresses larynx and hyoid bone? (Is lateral and deep to sternohyoid)

Answer 2

Sternothyroid, oroginating from posterior surface of manubrium to thyroid cartilage.

Question 3

What muscle depresses and retracts hyoid bone? (Is lateral to sternohyoid)

Answer 3

Omohyoid, originating from superior surface of scapula to lower border of hyoid bone.
Superior and inferior bellies united by intermediary tendon.

Question 4

What muscle depresses hyoid bone or elevates the larynx when hyoid is fixed? (It appears as a superior continuation of sternothyroid)

Answer 4

Thyrohyoid, originating from thyroid cartilage to the hyoid bone.