UNIT 1: brachial plexus

Question 1

what make up the roots of the brachial plexus?

Answer 1

union of anterior rami of c5/ c6/ c7/ c8/ t1

Question 2

how are the trunks formed?

Answer 2

superior: c5/c6
middle: c7
inferior: c8/ t1

Question 3

what do the trunks divide into?

Answer 3

anterior and posterior divisions

Question 4

how do the divisions combine to form the cords?

Answer 4

lateral - anterior divisions of superior/middle trunks
medial - anterior division of inferior trunk
posterior - all posterior divisions

Question 5

what are the terminal nerves that the cords branch into?

Answer 5

• musculocutaneous nerve (lateral cord)
• median nerve (lateral/ medial cord)
• ulnar nerve (medial cord)
• axillary/ radial nerve (posterior cord)

Question 6

how else can the brachial plexus be divided?

Answer 6

• supraclavicular: roots/trunks

- infraclavicular: cords

Question 7

what muscles does the dorsal scapular nerve innervate?

Answer 7

rhomboids

Question 8

what muscles does the suprascapular nerve innervate?

Answer 8

supraspinatus / infraspinatus

Question 9

what muscle does the subclavian innervate?

Answer 9

subclavius`

Question 10

what muscle does the long thoracic nerve innervate?

Answer 10

serratus anterior

Question 11

what muscle does the lateral/medial pectoral nerves innervate?

Answer 11

pectoralis major/ minor

Question 12

what do the medial cutaneous nerves innervate?

Answer 12

skin of arm and forearm

Question 13

what muscle does the upper/lower subscapular nerves innervate?

Answer 13

subscapularis/ teres major

Question 14

what muscle does the thoracodorsal nerve innervate?

Answer 14

latissimus dorsi

Question 15

what muscle does the axillary nerve innervate?

Answer 15

teres minor/ deltoids

Question 16

what muscle does the spinal accessory nerve innervate?

Answer 16

trapezius

Question 17

what muscle does the spinal nerves (c3/c4/c5) innervate?

Answer 17

levator scapulae