Forearm and Hand

Question 1

Common flexor and common extensor origin of humerus

Answer 1

Flexor = medial epicondyle 
Extensor = lateral epicondyle

Question 2

Which elbow joint is responsible for flexion of the elbow

Answer 2

Humeroulnar

Question 3

Blood supply to distal anterior forearm and hand

Answer 3

superficial palmar arch (pinky) = ulnar artery, gives rise to common digital arteries –> proper palmar digital arteries
deep palmar arch (thumb) = radial artery, gives rise to princeps policies artery –> radials indices artery

Question 4

Arteries of posterior forearm

Answer 4

Radial artery (via deep palmar arch and dorsal carpal arch)
Common interosseous artery (posterior interosseus artery)

Question 5

Muscles of superficial layer of forearm

Answer 5

Pronator teres, flexor carpi radialis, palmaris longus, and flexor carpi ulnaris

Question 6

Attachments of pronator teres

Answer 6

Proximal: coronoid process of ulna
Distal: middle of lateral surface of radius

Question 7

Actions of pronator teres

Answer 7

pronates and flexes forearm at elbow

Question 8

Innervation of pronator teres

Answer 8

medial nerve

Question 9

Attachments of flexor carpi radialis

Answer 9

Proximal: medial epicondyle of humerus
Distal: base of 2nd metacarpal

Question 10

Actions of flexor carpi radialis

Answer 10

flexes and abducts hand at wrist aka radial deviation

Question 11

Innervation of flexor carpi radialis

Answer 11

median nerve

Question 12

Attachements palmaris longus

Answer 12

Proximal: Medial epicondyle of humerus
Distal: flexor retinaculum, continuous with palmar aponeurosis

Question 13

Actions of palmaris longus

Answer 13

Flexes hand at wrist, tenses palmar aponeurosis

Question 14

Innervation of palmaris longus

Answer 14

median nerve

Question 15

Attachments of flexor carpi ulnaris

Answer 15

Proximal: medial epicondyle of humerus
Distal: pisiform, hook of hamate, 5th metacarpal

Question 16

Actions of flexor carpi ulnaris

Answer 16

Flexes and adducts hand at wrist

Question 17

Innervation of flexor carpi ulnaris

Answer 17

ulnar nerve

Question 18

Intermediate muscles of forearm

Answer 18

Flexor digitorum superficialis

Question 19

Attachments of flexor digitorum superficialis

Answer 19

Proximal: medial epicondyle of humerus, superior 1/2 of anterior border of radius
Distal: shafts of middle phalanges of medial 4 digits

Question 20

Actions of flexor digitorum superficialis

Answer 20

flexes middle phalanges at proximal interphalangeal joint, flexes proximal phalanges at metacarpophalangeal joints

Question 21

Innervation of flexor digitorum superficialis

Answer 21

median nerve

Question 22

Deep muscles of forearm

Answer 22

Flexor digitorum profundus, flexor pollicis longus, and pronator quadratus

Question 23

Attachments of flexor digitorum profundus

Answer 23

Proximal: proximal 3/4 of medial and anterior surface of ulna and interosseous membrane
Distal: bases of distal phalanges of 2nd-5th fingers

Question 24

Actions of flexor digitorum profundus

Answer 24

Flexes distal phalanges at interphalangeal joints (power grip)

Question 25

Innervation of flexor digitorum profundus

Answer 25

median and ulnar nerves

Question 26

Attachments of flexor pollicis longus

Answer 26

Proximal: anterior surface of radius and interosseous membrane
Distal: base of distal phalanx of thumb

Question 27

Actions of flexor pollicis longus

Answer 27

Flexes thumb

Question 28

Innervation of flexor pollicis longus

Answer 28

median nerve via anterior interosseous nerve

Question 29

Attachments of pronator quadratus

Answer 29

Proximal: distal 1/4 of anterior surface of ulna
Distal: distal 1/4 of anterior surface of radius

Question 30

Actions of pronator quadratus

Answer 30

pronates forearm, deep fibers bind radius and ulna together

Question 31

Innervation of pronator quadratus

Answer 31

median nerve via anterior interosseous nerve