gross anatomy of upper limbs 2

Question 1

pectoralis major action and nerve

Answer 1

action - medial rotation and adduction of shoulder joint. flexion of shoulder joint.
nerve - medial and lateral pectoral nerve

Question 2

pectoralis minor action and nerve

Answer 2

action - protracts scapula along with serratus anterior
nerve - medial and lateral pectoral nerve

Question 3

serratus anterior action and nerve

Answer 3

action - protracts the scapula
nerve - long thoracic nerve

Question 4

biceps brachii action and nerve

Answer 4

action - powerful supinator of the forearm
nerve - musculocutaneous nerve

Question 5

coracobrachialis action and nerve

Answer 5

action - weak flexor of shoulder joint
nerve - musculocutaneous nerve

Question 6

brachilais action and nerve

Answer 6

action - flexor of elbow joint
nerve - musculocutaneous nerve & small lateral part of radial nerve

Question 7

pronator teres action and nerve

Answer 7

action - pronator of forearm, weak flexor of the elbow joint
nerve - median nerve

Question 8

flexor carpi radialis action and nerve

Answer 8

action - flexor of wrist
nerve - median nerve

Question 9

flexor carpi ulnaris action and nerve

Answer 9

action - flexor and adductor of wrist
nerve - ulnar nerve

Question 10

palmaris longus action and nerve

Answer 10

action - weak flexor of the wrist
nerve - median nerve

Question 11

flexor digitorum superficialis action and nerve

Answer 11

action - flexion of the proximal interphlangeal joint
nerve - median nerve

Question 12

flexor pollicis longus action and nerve

Answer 12

action - flexor of the thumb
nerve - median nerve (ant interosseous branch)

Question 13

flexor digitorum profundus action and nerve

Answer 13

action - flexor of distal interphalangeal joint
nerve - medial part = ulnar nerve, lateral part = median nerve

Question 14

pronator quadratus action and nerve

Answer 14

action - principal pronator
nerve - median nerve

Question 15

role of intrinsic muscles of the hand

Answer 15

control precise movements of metacarpals and fingers

Question 16

thenar eminence (ball of the thumb)

Answer 16

flexor pollicis brevis, abductor pollicis brevis and opponens pollicis

Question 17

hypothenar eminence (ball of the little finger)

Answer 17

flexor digiti minimi, abductor digiti minimi, and opponens digiti minimi

Question 18

midpalmar muscles

Answer 18

adductor pollicis, lumbricals, palmar and dorsal interossei

Question 19

palmaris brevis action

Answer 19

improves the grip by steadying the skin on the ulnar side

Question 20

lumbricals action

Answer 20

flexion of the MP joints and extension of the PIP and DIP

Question 21

palmar interossei action

Answer 21

PAD - adductors of the fingers

Question 22

dorsal interossei action

Answer 22

DAB - abductors of the fingers

Question 23

which intricsince muscles are supplied by the ulnar nerve

Answer 23

all except thenar muscles and 1st and 2nd lumbricals which are supplied by median nerve

Question 24

adductor pollicis nerve supply

Answer 24

median and ulnar nerves

Question 25

palmar aponeurosis

Answer 25

protects the underlying long flexor tendons from bow-stringing

Question 26

musculocutaneous nerve derives from what cord

Answer 26

lateral cord

Question 27

what muscle does the musc. nerve pierce

Answer 27

coracobrachialis and descends between biceps and brachialis

Question 28

what does the musc. nerve continue as below the elbow

Answer 28

lateral cutaneous nerve of the forearm

Question 29

what cord does the ulnar nerve derive from

Answer 29

medial cord

Question 30

what cord does the median nerve derive from

Answer 30

medial and lateral cord enters the palm deep to the flexor retinaculum

Question 31

muscles that cross the shoulder joint to insert on and move the humerus

Answer 31

pectoralis major, latissimus dorsi, deltoid, supraspinatus, infraspinatus, teres minor, subscapularis, coracobrachialis, teres major

Question 32

bursae in relation to shoulder joint

Answer 32

subscapular bursa infrascapular bursa subacromial bursa synovial sheath around the long tendon of biceps

Question 33

bursae in relation to elbow joint

Answer 33

btwn triceps tendon and capsule of the joint subcutaneous bursa of olecranon process btwn biceps tendon and radial tuberosity