Suprahyoid and Infrahyoid Muscles

Question 1

Digastric

Answer 1

anterior belly: digastric fossa
of mandible; posterior belly: mastoid notch of temporal bone.

tendinous connection of both bellies through a fascial loop on the hyoid bone.

depresses mandible/ elevates hyoid

anterior belly: branch of Mylohyoid of V3; posterior belly: branch of VII

Question 2

Stylohyoid

Answer 2

posterior border of styloid process of temporal bone

hyoid bone, at junction of the body and greater cornu

elevates hyoid & draws it posteriorly

Stylohyoid branch of VII

Question 3

Mylohyoid

Answer 3

mylohyoid line of mandible

median raphe from chin to hyoid bone and onto hyoid

elevates floor of mouth & hyoid bone/ depresses mandible

Mylohyoid branch of Inferior alveolar branch of V3

Question 4

Geniohyoid

Answer 4

inferior genial tubercle

anterior body of hyoid

elevates the hyoid and draws it forward/ depresses mandible

C1 through the Hypoglossal N.

Question 5

Sternohyoid

Answer 5

posterior manubrium, sternoclavicular lig., and medial end of clavicle

medial lower body of hyoid

depresses hyoid bone

Ansa cervicalis

Question 6

Sternothyroid

Answer 6

posterior manubrium, deep to sternohyoid; 1st costal cartilage

oblique line on lamina of thyroid cartilage

depresses larynx

Ansa cervicalis

Question 7

Thyrohyoid

Answer 7

oblique line on thyroid cartilage

lower border of body and greater cornu of hyoid

depresses hyoid bone/ elevates larynx

Thyrohyoid branch of C1 through the Hypoglossal

Question 8

Omohyoid

Answer 8

inferior belly: upper border of scapula and suprascapular lig.; superior belly: central tendon located deep
to sternocleidomastoid; here, superior belly unites with inferior belly

lower border of body of hyoid

depresses hyoid

Ansa cervicalis