Triangles of the Neck

Question 1

Platysma

inn, fnct, location

Answer 1

1. Lies within superficial fascia
2. muscle of fascial exp
3. inn. by CN VII

Question 2

Sternocleidomastoid (SCM)

Answer 2

1. O/I: Mastoid process to heads of clavicle and sternum
2. A: unilateral- flex neck and CL rotation of head ; bilateral- ext. upper cerv. vert. and flex lower cerv. vert.
3. inn by CN XI

Inspiration, Posture, Vestibular

Question 3

Suprahyoid Group Muscles

Answer 3

1. Mylohoid (n. to mylohyoid V3)
2. Sylohyoid (CN VII)
3. Epigastric (A and P bellies); (CN VII)

Fnct: Elevate Hyoid

Question 4

mylohyoid inn.

Answer 4

n to mylohyoid (V3)

Question 5

sylohyoid inn.

Answer 5

CN VII

Question 6

epigastric inn.

Answer 6

CN VII

Question 7

infrahyoid group

Answer 7

1. sternohyoid (Ansa Cervicalis)
2. omohyoid (Ansa Cervicalis)
3. sternothyroid (Ansa Cervicalis)
4. thyrohyoid (n. to thyrohyoid)

Depress Hyoid Bone

Question 8

Scalenes

Answer 8

1. Ant, Middle, Posterior
2. Laterally Flex Neck
3. Posture and Inspiration
4. CV TPs to RIbs 1 and 2
5. inn. by C3-C8 spinal nerve

Question 9

Cervical Plexus

Answer 9

• ventral rami (C1-C4)
• Sensory and Motor

lesser occipital nerve (C2)
great auricular nerve (C2-3)
transverse occipital nerve (C2-C3)
suprascapular nerve (C3-C4)
phrenic nerve (C3-C5)
Ansa Cervicalis (supplies infrahyoid but not thyrohyoid)