ForeArm 2 (Nerves) Flashcards
Anatomical snuff box position
dorsum of wrist & visible when thumb is extended
anatomical snuff box boundaries
medial - extensor pollicis longus
lateral - extensor pollicis longus and brevis
roof of anatomical snuff box
skin
superficial fascia
deep fascia
floor of anatomical snuff box
styloid process of radius & 2 carpal bones
scaphoid and trapezium
contents of anatomical snuff box
- radial artery
2. tendons of extensor carpi radialis longus and brevis
ulnar nerve origin
medial cord of brachial plexus
c8 & t1 but fibers from c7 can reach the ulnar nerve
ulnar nerve course axilla arm upper half middle lower
axilla: descends
arm:
upper half: descends on brachial artery
middle: pierces medial intermuscular septum
lower: descends until lies on medial head of triceps
ulnar nerve course elbow forearm wrist end
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
branches of ulnar nerve in axilla & arm
none
branches of ulnar nerve in forearm
- articular branches - supply elbow joint
- muscular branches - supply flexor capri ulnaris and 1/2 flexor digitorum profundus
- 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
terminal branches of ulnar nerve
@ flexor retinaculum
superficial & deep branch
superficial branch of ulnar nerve
supplies palmaris brevis muscle & divides into 2 palmar digital branches to supply skin on palmar surfaces of medial 1 1/2 fingers
deep branch of ulnar nerve gives
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
median nerve origin
in axilla by 2 roots from medial and lateral cord
*has all nerve root levels, C6,7,8 & T1
median nerve course axilla upper arm middle lower elbow joint leaving arm
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
median nerve course
forearm
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
the 2 heads of the pronator teres is separated by
deep head of muscle from ulnar artery
median course nerve
wrist & end
wrist - median nerve enters palm by passing deep to flexor retinaculum
end - ends in carpal tunnel by dividing into 2 terminal divisions - later & medial
branches of median nerve in axilla & arm
none
branches of median nerve in forearm
describe first 2
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
anterior interosseous nerve
arises from medial nerve between 2 heads of pronator teres
