Nerve pathways

Question 1

Roots of median Nerve

Answer 1

lateral (C5,6,7) and medial (C8 and T1) cords of the brachial plexus

Question 2

Path of the Median nerve in relation to brachial A?

Answer 2

Descends lateral to BA, crosses to its medial side (passing ant).

Question 3

Median N path passes deep to?

Answer 3

bicipital aponeurosis and the median cubital vein at the elbow

Question 4

Median N passes between which 2 heads?

Answer 4

two heads of the pronator teres muscle. and runs on the deep surface of flexor digitorum superficialis (within its fascial sheath)

Question 5

MEdian N path by the wrist?s sup and deep to?

Answer 5

becomes superficial between the tendons of flexor digitorum superficialis and flexor carpi radialis, deep to palmaris longus tendon.

Question 6

Median N how does it enter the palm?

Answer 6

passes deep to the flexor retinaculum to enter the palm, but lies anterior to the long flexor tendons within the carpal tunnel

Question 7

MEdian N supplies?

Answer 7

forearm muscles, and flexors. LOAF, sensory hand over thumb and lateral 2.5 figners, palmer cutaneous branch,
Pronator teres
Flexor carpi radialis
Palmaris longus
Flexor digitorum superficialis
Flexor pollicis longus
Flexor digitorum profundus (only the radial half)

Question 8

MEdian N damaged by?

Answer 8

wrist, elbow, anterior interossus N

Question 9

paralysis and wasting of thenar eminence muscles and opponens pollicis (ape hand deformity)
sensory loss to palmar aspect of lateral (radial) 2 ½ fingers

Answer 9

carpal tunnel syndroe, median N damage,

Question 10

unable to pronate forearm
weak wrist flexion
ulnar deviation of wrist

Answer 10

injury of median N at elbow

Question 11

What branch of median N leaves just below the elbow?

Answer 11

Anterior interosseous

Question 12

ANt. int. N damage results in?

Answer 12

results in loss of pronation of forearm and weakness of long flexors of thumb and index finger

Question 13

Ulnar N roots?

Answer 13

medial cord of brachial plexus (C8, T1)

Question 14

Motor ulnar N?

Answer 14

medial two lumbricals
aDductor pollicis
interossei
hypothenar muscles: abductor digiti minimi, flexor digiti minimi
flexor carpi ulnaris

Question 15

Sensory Ulnar N?

Answer 15

medial 1 1/2 fingers (palmar and dorsal aspects)

Question 16

Ulnar N path?

Answer 16

posteromedial aspect of the upper arm to the flexor compartment of the forearm to palm of hand via guyon’s canal.

Question 17

Ulner nerve path in palmer?

sup and deep to?

Answer 17

via the Guyon’s canal, superficial to the flexor retinaculum and lateral to the pisiform bone

Question 18

Claw hand caused by?

Answer 18

hyperextension of the metacarpophalangeal joints and flexion at the distal and proximal interphalangeal joints of the 4th and 5th digits

Question 19

Ulnar N damage at wrist? c

Answer 19

claw hand, wasting and paralysis of intrinsic hand (except lateral two lumbricals), hypothenar msucles, sensory loss to medial 1.5 fingers

Question 20

ulnar N damage at elbow, causes wrist deviation to?

Answer 20

radial side

Question 21

branches of ulnar N?

Answer 21

musclar, palmar cutanoues (middle of forwarm), dorsal cutaneous, superficial bracnh, deep branch

Question 22

Root of radial N?

Answer 22

posterior cord of the brachial plexus (root values C5 to T1)

Question 23

What muscles does the radial N lie on in the axilla?

Answer 23

subscapularis, latissimus dorsi and teres major

Question 24

Is the Radial N posterior to axillary artery?

Answer 24

yes, lies on the muscles subscapularis, latissimus dorsi and teres major

Question 25

What does Radial N pass between to enter the arm?

Answer 25

brachial artery and the long head of triceps (medial to humerus).

Question 26

In the arm , path of the Radial N?

Answer 26

Medial to humerus, spirals around posterior surface int he radial groove, descends in front of lateral epicondyle (pierces the intermuscular septum)

Question 27

At the wrist, what is the path of the radial N?

Answer 27

At the lateral epicondyle it lies deeply between brachialis and brachioradialis where it then divides into a superficial and deep terminal branch.

Question 28

What does the deep branch of the radial N become?

Answer 28

Deep branch crosses the supinator to become the posterior interosseous nerve

Question 29

Posterior interossus N innervates? (branch of radial n)

Answer 29

``` Supinator Extensor carpi ulnaris Extensor digitorum Extensor indicis Extensor digiti minimi Extensor pollicis longus and brevis Abductor pollicis longus ```

Question 30

Motor innervation of radial nerve (main) ?

Answer 30

Triceps Anconeus Brachioradialis Extensor carpi radialis

Question 31

Radial N in shoulder innervates?

Answer 31

triceps long head. - abduction instability this is minor

Question 32

Radial N in arm innervates?

Answer 32

triceps - loss of elbow extension if damaged

Question 33

Radial N in forearm innervates?

Answer 33

Supinator Brachioradialis Extensor carpi radialis longus and brevis - causes weakness of supination of prone hand and elbow flextion in mid prne positon

Question 34

Radial N sensory damage?

Answer 34

sensory loss to small area between the dorsal aspect of the 1st and 2nd metacarpals

Question 35

Wrist drop caused by which nerve?

Answer 35

radial nerve damage