ForeArm 2 (Nerves)

Question 1

Anatomical snuff box position

Answer 1

dorsum of wrist & visible when thumb is extended

Question 2

anatomical snuff box boundaries

Answer 2

medial - extensor pollicis longus

lateral - extensor pollicis longus and brevis

Question 3

roof of anatomical snuff box

Answer 3

skin
superficial fascia
deep fascia

Question 4

floor of anatomical snuff box

Answer 4

styloid process of radius & 2 carpal bones

scaphoid and trapezium

Question 5

contents of anatomical snuff box

Answer 5

1. radial artery

2. tendons of extensor carpi radialis longus and brevis

Question 6

ulnar nerve origin

Answer 6

medial cord of brachial plexus

c8 & t1 but fibers from c7 can reach the ulnar nerve

Question 7

ulnar nerve course
axilla
arm
upper half
middle
lower

Answer 7

axilla: descends
arm:
upper half: descends on brachial artery
middle: pierces medial intermuscular septum
lower: descends until lies on medial head of triceps

Question 8

ulnar nerve course
elbow
forearm
wrist
end

Answer 8

elbow: descends behind medial epicondyle giving it shallow groove then pass between heads of flexor carpi ulnaris

forearm: descends on flexor digitorum profundus. covered by flexor carpi ulnaris
in lower 1/3 of forearm it becomes superficial between flexor carpi ulnaris and flexor digitorum superficialis

wrist: descends superficial to flexor retinaculum, lateral to pisiform, medial to ulnar artery
end: in front of flexor retinaculum by dividing into superficial and deep branch

Question 9

branches of ulnar nerve in axilla & arm

Answer 9

none

Question 10

branches of ulnar nerve in forearm

Answer 10

1. articular branches - supply elbow joint
2. muscular branches - supply flexor capri ulnaris and 1/2 flexor digitorum profundus
3. cutaneous branches
   a. palmar - skin and 1/2 of palm
   b. dorsal - skin of 1/3 dorsum of hand and medial 1 1/2 fingers

Question 11

terminal branches of ulnar nerve

Answer 11

@ flexor retinaculum

superficial & deep branch

Question 12

superficial branch of ulnar nerve

Answer 12

supplies palmaris brevis muscle & divides into 2 palmar digital branches to supply skin on palmar surfaces of medial 1 1/2 fingers

Question 13

deep branch of ulnar nerve gives

Answer 13

muscular branch - muscles of hypothenar eminence, medial 2 lumbricals, all interosseous muscles, adductor pollices, and additional supply to flexor pollices brevis
articular - wrist and metacarpo-phalangeal joints

Question 14

median nerve origin

Answer 14

in axilla by 2 roots from medial and lateral cord

*has all nerve root levels, C6,7,8 & T1

Question 15

median nerve course 
axilla
upper arm
middle 
lower
elbow joint
leaving arm

Answer 15

axilla: descends
arm:
upper - descends lateral to brachial artery
middle - crosses brachial artery to become medial to it
lower - descends medial to brachial artery lying on brachilis
elbow joint: lies in front of brachilis and behind bicipital aponeurosis which separates it from median cubital vein.
leaves arm by passing into cubital fossa of forearm

Question 16

median nerve course

forearm

Answer 16

forearm: enters cubital fossa and crossed superficially by bicipital aponeurosis.

leaves cubital fossa by passing b/w 2 heads of pronator teres

then, reaches flexor digitorum superficialis and descends between it and the flexor digitorum profundus
right above the wrist

it becomes superficial between flexor capri radialis and flexor digitorum superficialis

Question 17

the 2 heads of the pronator teres is separated by

Answer 17

deep head of muscle from ulnar artery

Question 18

median course nerve

wrist & end

Answer 18

wrist - median nerve enters palm by passing deep to flexor retinaculum

end - ends in carpal tunnel by dividing into 2 terminal divisions - later & medial

Question 19

branches of median nerve in axilla & arm

Answer 19

none

Question 20

branches of median nerve in forearm

describe first 2

Answer 20

articular branches (in cubital fossa) - supply elbow & superior radio-ulnar joint

muscular branches (in cubital fossa) - supply 4 muscles ; pronator teres, flexor capri radialis, palmaris longus, and flexor digitorum superficialis

anterior interosseous nerve

palmar cutaneous branch

Question 21

anterior interosseous nerve

Answer 21

arises from medial nerve between 2 heads of pronator teres