Suprahyoid Muscles

Question 1

What muscle opens the mouth and depresses mandible?

Answer 1

The Anterior and Posterior belly of Diagastric.
Anterior originates from the lower margin of mandible and Posterior originates from mastoid process of temporal bone, both inserting in a CT loop to hyoid bone.

Question 2

What muscle elevates and retracts hyoid bone?

Answer 2

Stylohyoid, originating from styloid process of temporal bone to hyoid bone.

Question 3

What muscle elevates hyoid bone and floor of mouth? (Is deep to diagastric)

Answer 3

Mylohyoid, originating from medial surface of mandible and inserting at hyoid bone and median raphe (CT midsaggital of mylohyoid muscles).

Question 4

What muscle elevates and protracts the hyoid bone? (Is deep to mylohyoid)

Answer 4

Geniohyoid, originating from the inner surface of mandibular symphysis to hyoid bone.