Posterior Compartment of Forearm Muscles

Question 1

what are the 6 superficial muscles of the posterior compartment of the forearm

Answer 1

1. brachioradialis
2. extensor carpi radialis longus
3. extensor carpi radialis brevis
4. extensor digitorum
5. extensor carpi ulnaris
6. extensor digiti minimi

Question 2

what are the 5 deep muscles of the posterior compartment of the forearm

Answer 2

1. supinator
2. abductor pollicis longus
3. extensor pollicis brevis
4. extensor pollicis longus
5. extensor indicis

Question 3

what are the attachments of the brachioradialis

Answer 3

proximal: lateral 2/3 of supracondylar ridge of humerus
distal: distal end of radius

Question 4

what is the torque of the brachioradialis

Answer 4

flexor torque on the forearm (no wrist)

Question 5

what is the innervation and blood supply of the brachioradialis

Answer 5

radial nerve (C5, C6, C7)
radial recurrent artery

Question 6

what are the attachments of the extensor carpi radialis longus

Answer 6

proximal: lateral supracondylar ridge of humerus
distal: base of 2nd metacarpal

Question 7

what is the torque of the extensor carpi radialis longus

Answer 7

extensor & abductor on hand at wrist
maintains neutral wrist when making a fist

Question 8

what are the innervations and blood supply of extensor carpi radialis longus

Answer 8

radial nerve (C6 & C7)
radial recurrent artery

Question 9

what are the attachments of the extensor carpi radialis brevis

Answer 9

proximal: lateral epicondyle of humerus
distal: base of 3rd metacarpal

Question 10

what is the torque of the extensor carpi radialis brevis

Answer 10

extensor & abductor on hand at wrist

Question 11

what is the innervation and blood supply of the extensor carpi radialis brevis

Answer 11

deep branch radial nerve (C7 & C8)
radial artery

Question 12

what are the attachments of the extensor digitorum

Answer 12

proximal: lateral epicondyle of humerus
distal: extensor expansions digits 2,3,4

Question 13

what is the torque of the extensor digitorum

Answer 13

extensor digits 2,3,4 on MP & IP joints
extensor on manus at wrist

Question 14

what is the innervation and blood supply of the extensor digitorum

Answer 14

posterior interosseus nerve (C7 & C8)
interosseous recurrent & posterior interosseous artery

Question 15

what are the attachments of the extensor carpi ulnaris

Answer 15

proximal: lateral epicondyle of humerus & posterior boarder of ulna
distal: base of 5th metacarpal

Question 16

what is the torque of the extensor carpi ulnaris

Answer 16

extensor & adductor on hand at wrist

Question 17

what is the innervation and blood supply of the extensor carpi ulnaris

Answer 17

posterior interosseus nerve (C7 & C8)
ulnar artery

Question 18

what are the attachments of the extensor digiti minimi

Answer 18

proximal: lateral epicondyle of humerus
distal: extensor explansion of 5th digit

Question 19

what is the torque of the extensor digiti minimi

Answer 19

extensor 5th digit at MP joint and IP joints

Question 20

what is the innervation and blood supply to the extensor digiti minimi

Answer 20

posterior interosseus nerve (C7 & C8)
interosseous recurrent artery

Question 21

what are the attachments of the supinator

Answer 21

proximal: lateral epicondyle of humerus, radial collateral & annular ligaments, supinator fossa & proximal crest of ulna

distal: lateral, posterior & anterior surfaces of proximal 1/3 of radius

Question 22

what is the torque of the supinator

Answer 22

supinates the forearm

Question 23

what are the innervations and blood supply to the supinator

Answer 23

deep branch of radial nerve (C7 & C8)
recurrent interosseous artery

Question 24

what are the attachments of the abductor pollicis longus

Answer 24

proximal: posterior surface of ulna, interosseous membrane & radius
distal: base of 1st metacarpal

Question 25

what is the torque of the abductor pollicis longus

Answer 25

abductor & extensor thumb at carpometacarpal (CM) joint

Question 26

what innervates and provides blood supply to the abductor pollicis longus

Answer 26

posterior interosseous nerve (C7 & C8) posterior interosseous artery

Question 27

what are the attachments of the extensor pollicis brevis

Answer 27

proximal: posterior surfaces of radius & interosseous membrane distal: base of proximal phalanx of thumb

Question 28

what is the torque of the extensor pollicis brevis

Answer 28

extensor on proximal phalanx of thumb at CM & MCP joints extensor and abductor at hand

Question 29

what is the innervation and blood supply to the extensor pollicis brevis

Answer 29

posterior interosseous nerve (C7 & C8) posterior interosseous artery

Question 30

what are the attachments of the extensor pollicis longus

Answer 30

proximal: posterior surface of middle 1/3 of ulnar & interosseous membrane distal: base of distal phalanx of thumb

Question 31

what is the torque of the extensor pollicis longus

Answer 31

extensor on distal phalanx thumb at CM, MCP, & IP joints

Question 32

what innervates and supplies blood to the extensor pollicis longus

Answer 32

posterior interosseous nerve (C7 & C8) posterior interosseous artery

Question 33

what makes up the anatomical snuff box

Answer 33

extensor pollicis longus extensor pollicis brevis

Question 34

what are the attachments of the extensor indicis

Answer 34

proximal: posterior surface of ulna & interosseous membrane distal: extensor expansion of 2nd digit

Question 35

what is the torque of the extensor indicis

Answer 35

extensor on the 2nd digit

Question 36

what is the innervation and blood supply to the extensor indicis

Answer 36

posterior interosseous nerve (C7 & C8) posterior interosseous artery