Suprahyoid Muscles

Question 1

Digastric, anterior belly

Answer 1

Origin: digastric fossa of mandible

Insertion: hyoid bone via the digastric tendon

Innervation: mylohyoid nerve (CN V3)

Action: lowers mandible or raises hyoid

Question 2

Digastric, posterior belly

Answer 2

Origin: medial aspect of mastoid process

Insertion: hyoid bone via the digastric tendon

Innervation: CN VII

Action: elevates and retracts hyoid

Question 3

Mylohyoid

Answer 3

Origin: mylohyoid line of mandible

Insertion: hyoid bone and mylohyoid raphe

Innervation: mylohyoid nerve (CV V3)

Action: supports and elevates floor of mouth, raises hyoid

Question 4

Geniohyoid

Answer 4

Origin: inferior mental spine of mandible

Insertion: hyoid bone

Innervation: C1 branch travelling with CN XII

Action: draws mandible and hyoid toward each other

Question 5

Stylohyoid

Answer 5

Origin: styloid process

Insertion: body of the hyoid bone

Innervation: CN VII

Action: elevates and retracts hyoid