posterior triangle updated

Question 1

list of mm in posterior triangle

Answer 1

• scm
• trapezius
• splenius capitis
• anterior, middle, posterior scalene
• omohyoid m (inferior)

Question 2

action of scm

Answer 2

unilateral: tilt (same) and rotate (opposite)
bilateral: flexion of neck

Question 3

action of trap

Answer 3

unilateral: tilt (same)
bilateral: extend neck

Question 4

action of splenius capitis m

Answer 4

unilateral: tilt (same); rotate (same)
bilateral: extend neck

Question 5

action anterior scalene m

Answer 5

bilateral: flex neck, elevate rib 1
unilateral: flex neck (same)

Question 6

action middle scalene m

Answer 6

unilateral: flex neck (same)
bilateral: flex neck and elevate rib 1

Question 7

posterior scalene m action

Answer 7

unilateral: flex neck (same)
bilateral: flex neck and elevate rib 2

Question 8

subclavian artery is behind which structures and in front of which

Answer 8

behind anterior scalene m and clavicle and subclavian v and phrenic n.
in front of middle scalene m

Question 9

phrenic n sits on what m

Answer 9

anterior scalene m

Question 10

what veins drain into EJV

Answer 10

posterior auricular v and posterior branch of retromandibular v

Question 11

what m does EJV lie upon

Answer 11

scm

Question 12

cutaneous branches of cervical plexus

Answer 12

• lesser occipital n (C2)
• greater auricular (C2-C3)
• transverse cervical n (C2-C3)
• supraclavicular nn (C3-C4)

Question 13

lesser occipital n supplies

Answer 13

• skin of neck

- scalp posterior to ear

Question 14

greater auricular n supplies

Answer 14

• portion of auricle
• scalp posterior to ear
• skin of parotid region
• parotid gland
• skin from angle of mandible to mastoid area

Question 15

name 2 motor branches of cervical plexus

Answer 15

• phrenic n

- ansa cervicalis

Question 16

phrenic n is ___ to vagus n

Answer 16

lateral

Question 17

cervical plexus is made up of

Answer 17

anterior rami of cervical nn C1 to C4

Question 18

ansa cervicalis

Answer 18

• C1 to C3

- supplies sternohyoid, sternothyroid, and omohyoid mm