Cutaneous Innervation and Brachial Plexus Injuries

Question 1

Axillary cutaneous innervation

Answer 1

Above bicep

Question 2

Lateral antebrachial cutaneous is branch of

Answer 2

Musculocutaneous

Question 3

Cutaneous innervation of palmar side of hand

Answer 3

Ulnar nerve medially

Median nerve laterally

Question 4

Cutaneous innervation of dorsal side of hand

Answer 4

Ulnar nerve medially
Radial nerve laterally
Median of fingertips of 2 and 3

Question 5

Roots, trunks, and divisions of brachial plexus lie in

Answer 5

Lower part of neck

Question 6

Cords and branches of brachial plexus lie in

Answer 6

Axilla

Question 7

Long thoracic nerve injury

Answer 7

Paralysis of serratus anterior
Inability to rotate scapula
Cannot raise arm above head
Winged scapula

Question 8

Suprascapular nerve injury

Answer 8

Loss of shoulder abduction between 0 and 15 degrees (supraspinatus)
Weakness of lateral rotation (infraspinatus)

Question 9

Axillary nerve injury

Answer 9

Loss of deltoid and teres minor

Unable to abduct shoulder and loss of sensation of lower half of deltoid

Question 10

Musculocutaneous nerve injury

Answer 10

Weakened flexion and supination of forearm

Loss of sensation of lateral forearm

Question 11

Radial nerve injury at axilla

Answer 11

Loss of extension at elbow, wrist, and digits
Loss of supination
Distal wrist drop
Sensory loss on posterior all the way down

Question 12

Radial nerve injury at mid-arm vs. axilla

Answer 12

Can still extend the elbow
Sensory loss only on forearm and thumb
Still has distal wrist drop

Question 13

Radial nerve injury at wrist

Answer 13

No wrist drop or motor loss

Sensory loss on dorsum of thumb

Question 14

Median nerve injury at elbow

Answer 14

Supracondylar fracture of humerus 
Weakened wrist flexion (ulnar deviation)
Loss of pronation 
Loss of 2 lateral lumbricals 
Ape hand 
Hand of benediction 
Sensory loss of palmar surface of lateral hand and palmar surface of lateral 3 digits

Question 15

Ape hand

Answer 15

Flattened thenar eminence with loss of thumb opposition

Question 16

Hand of benedition

Answer 16

Inability to flex lateral 3 digits and cannot make complete fist

Question 17

Median nerve wrist injury

Answer 17

Same but
NO HAND OF BENEDICTION
Normal wrist flexion, finger flexion, and pronation

Question 18

Ulnar nerve elbow injury

Answer 18

Medial epicondyle fracture
Minimal weakening of wrist flexion (radial deviation)
Loss of thumb adduction
Loss of abduction and adduction of digits 2-5
Weakend IP extension more pronounced in digits 4 and 5
Sensory loss on medial digits and hypothenar eminence

Question 19

Claw hand indicates

Answer 19

Ulnar nerve injury at elbow

Question 20

Upper plexus injury paralysis

Answer 20

Paralysis of supraspinatus, infraspinatus, biceps, coracobrachialis, brachials, deltoid, and teres minor

Question 21

Upper plexus injury motor deficits

Answer 21

Shoulder abduction
Lateral rotation
Shoulder flexion 
Elbow flexion 
Supination

Question 22

Sign of upper plexus injury

Answer 22

Waiters tip position

Question 23

Name of C5 and C6 injury

Answer 23

Erb-Duchenne palsy

Question 24

Lower plexus injury cause

Answer 24

Excessive abduction

Question 25

Causes of upper plexus injury

Answer 25

Displacement of head and depression of shoulder

Question 26

Paralysis of lower plexus injur y

Answer 26

All intrinsic muscles of the hand

Question 27

Sign of lower plexus injury

Answer 27

Claw hand and ape hand

Loss of snesation of medial side of arm and forearm, medial hand, and medial 1 and 1/2 fingers

Question 28

Nerves affected by lower plexus injury

Answer 28

Ulnar and median nerves