Muscles by action

Question 1

5 Medial Rotation of humerus

Answer 1

1. Teres major (C5,6) Lower subscapular nerve
2. Pectoralis major (c5,6,7,8,t1)LP,MP
3. Deltoid (c5,6) axillary
4. Subscapularis (C5,6,7)- Upper and lower Subscapular n.
5. Latissimus Dorsi

Question 2

3 Lateral Rotation of humerus

Answer 2

1. deltoid (5,6) axillary
2. Teres Minor (5,6) axillary
3. Infraspinatus (5,6) subscapular n.

Question 3

Downward rotates scapula

Answer 3

1. Rhomboids (c5) dsn

2. Levator Scapula (c5) dsn

Question 4

Upward Rotates Scapula

Answer 4

1. Serratus anterior (c5,6,7) LTN

Question 5

ADDUCTS arm

Answer 5

1. pectoralis major (all)

2. Teres Major (C5,6) Lower subscapular

Question 6

ABDUCTS arm

Answer 6

1. Supraspinatus (suprascapular nerve c5,c6)

2. deltoid (c5,c6) axillary

Question 7

Musculocutaneous injury in axilla

Answer 7

Weak upper limb flexion
severe weak forearm flexion
weak supination from partially flexed position (biceps)

Question 8

Radial n lesion fractured humerus in radial groove

Answer 8

Wrist drop

no forearm extension

Question 9

Median n injury in axilla

Answer 9

Hand of benedict
no pronation
no digital and wrist flexion 
no palmar sensation
can lead to ape hand

Question 10

Radial n lesion at neck of radius (deep radial n)

Answer 10

Wrist drop (not as severe)
ECRL & ECRB OK
Lost extension at PIP of fingers and thumb

Question 11

Median n injury at wrist/carpal tunnel syndrome

Answer 11

Thenar eminence wasting
Lost palmar sensation
pain in forearm

Question 12

Medain n injury at wrist from distal radius fracture

Answer 12

Thenar eminence wasting

Still has palmar sensation

Question 13

Ulnar n injury in Axilla, arm, or medial epicondylar fracture

Answer 13

Motor and sensory loss to hand
Claw hand deformity
no PADs DABS
no flex/extend mp ip joints
cant make a fist

Question 14

Erb-Duchenne paralysis

7 muscles

Answer 14

C5/C6 root lesion
-Waiters tip deformity

-deltoid, biceps, brachialis ,brachioradialis, supraspinatus, infraspinatus, teres minor

Question 15

Median nerve anterior interosseous syndrome

Answer 15

pinch sign– (cant make OK sign)

-ok skin sensation

Question 16

Ulnar lesion at elbow

Answer 16

Claw Hand (partial)
no DIP flexion
No skin sensation to ulnar innervated areas

if sensation lost in forearm/arm then medial cord/inferior trunk lesion

Question 17

Ulnar lesion at wrist

Answer 17

Claw Hand (partial)
ok DIP flexion
ok wrist flexion
ok skin sensation on dorsum of hand except distal 1.5 digits

Question 18

Midshaft fracture of humerus

Answer 18

Wrist drop (radial n, profunda brachii)

Question 19

Distal humerus fracture

Answer 19

ulnar n at medial epicondyle- Claw hand

median n & brachial artery- Hand of benediction

Question 20

Radial lesion in axilla

Answer 20

crutch palsy
wrist drop
no skin sensation to lateral and posterior arm, posterior forearm, dorsum of hand

Question 21

Radial lesion in arm

Answer 21

Saturday night palsy
wrist drop
no skin sensation to posterior forearm, dorsum of hand
No wrist extention

Question 22

Radial lesion in forearm

Answer 22

radial deviation in wrist extention

ok cutaneous sensation