BRACHIAL PLEXUS

Question 1

what are the branches from lateral to medial?

Answer 1

musculocutaneous
axillary
median
radial
ulnar

Question 2

which branches come off the lateral cord?

Answer 2

musculocutenaous and branch to median

Question 3

which branches come off posterior cord?

Answer 3

axillary and radial

Question 4

which branches come off medial cord?

Answer 4

ulnar and branch to median

Question 5

what are the nerve roots of the musculocutaneous nerve?

Answer 5

C5-C7

Question 6

what are the nerve roots of the axillary nerve?

Answer 6

C5 and C6

Question 7

what are the nerve roots of the radial nerve?

Answer 7

C5-T1

Question 8

what are the nerve roots of the median nerve?

Answer 8

C5-T1

Question 9

what are the nerve roots of the ulnar nerve?

Answer 9

C8 and T1

Question 10

under what structure are the division found?

Answer 10

clavicle

Question 11

outline the pathway of the axillary nerve?

Answer 11

forms in axilla form posterior cord, posterior to axillary artery and anterior to subscpaularis muscle
exits axilla at inferior border of subscapularis via the quadrangle space and passes medially to the surgical neck of the humerus where it divides into 3 branches

Question 12

outline the pathway of the radial nerve?

Answer 12

continues from posterior cord of brachial plexus and arises in axilla region posterior to axillary artery
exist axilla via triangular interval inferiorly
descends down arm in radial groove (wrapping around from medial to lateral)
wraps around humerus laterally
travels anteror to lateral epicondyle of humerus through cubital fossa and terminates at front of forearm (pierces through supinator) by dividing into a deep and superficial branch

Question 13

outline the pathway of the ulnar nerve?

Answer 13

continues from medial cord and descends between axillary artery and vein. proceeds down medial aspect of arm with brachial artery lateral to it.
at the mid point of the arm, it penetrates the medial fascial septum to enter the posterior compartment of the arm
pases posterior to the elbow through the ulnar tunnel (between medial epicondyle and olecranon)
in the forearm it pierces the 2 heads of the flexor carpi ulnaris and travels deep to the muscle, alongside the ulna
it gives 3 branches

Question 14

outline the pathway of the musculocutaneous nerve?

Answer 14

terminal branch of lateral cord
leaves axilla and pierces coracobrachialis
passes down flexor compartment of upper arm, superficial to brachialis but deep to biceps brachii
pierces deep fascia lateral to biceps brachial to emerge lateral to biceps tendon and brachioradialis
continues into forearm as ;lateral cutaneous nerve

Question 15

outline the pathway of the median nerve?

Answer 15

from medial and lateral cords
descends down arm lateral to brachial artery, then crosses the artery halfway down and sits medial to it
enters the anterior compartment of forearm via cubital fossa
travels between flexor digitorum profundus and superfiicalis
gives 2 main branches in forearm