Canine Head-Various muscles

Question 1

Digastricus

Answer 1

runs from occipital area to ventral part of body of mandible

Function: opens jaw

Nerve: trigeminal nerve

Question 2

Temporalis

Answer 2

temporal bone to coronoid process of mandible

Function: closes jaw

Nerve: trigeminal nerve

Question 3

Masseter

Answer 3

zygomatic arch to masseteric fossa (depression on ramus of mandible)

Function: closes jaw

Nerve: trigeminal nerve

Question 4

Pterygoid

Answer 4

pterygopalatine fossa (below orbial fossa on skull) to ramus and angular process of mandible

Function: closes jaw

Nerve: trigeminal nerve

Question 5

Sternohyoideus

Answer 5

sternum to basihyoid (paired muscle meets ventrally, important for tracheostomy)

Function: retracts tongue

Question 6

Intrinsic muscles of tongue

Answer 6

Run as bundles of fibers longitudinally, transversely, and vertically to give great mobility to tongue

Question 7

Styloglossus

Answer 7

extrinsic tongue muscle, stylohyoid bone to middle of tongue

Function: retract and elevate tongue

Nerve: hypoglossal nerve

Question 8

Hyoglossus

Answer 8

extrinsic tongue muscle, thyro- and basihyoid to root of tongue

Function: retract and depress tongue

Nerve: hypoglossal nerve

Question 9

Genioglossus

Answer 9

extrinsic tongue muscle, mandibular symphysis to middle of tongue

Function: protrude and retract apex of tongue

Nerve: hypoglossal