Muscles of Chewing and Swallowing

Question 1

Genioglossus

Answer 1

O: Superior mental spine on posterior surface of mental protuberance
I: Inferior surface of tongue from root to apex
A: Unilateral action draws tongue to one side; bilateral action depresses midline of tongue or protrudes tongue
N: Hypoglossal

Question 2

Hyoglossus

Answer 2

O: Body and greater horn of hyoid bone
I: Lateral and inferior surfaces of tongue
A: Depresses tongue
N: Hypoglossal

Question 3

Styloglossus

Answer 3

O: Styloid process of temporal bone and ligament from styloid process to mandible
I: Superolateral surface of tongue
A: Draws tongue upward and posteriorly
N: Hypoglossal

Question 4

Palatoglossus

Answer 4

O: Soft palate
I: Lateral surface of tongue
A: Elevates root of tongue and closes oral cavity off from pharynx; forms palatoglossal arch at rear of oral cavity
N: Accessory and Vagus