PPT 11

Question 1

extensor carpi radialis longus & brevis action

Answer 1

wrist extension
wrist radial deviation
ECRL active during fist clenching

Question 2

extensor carpi radialis longus & brevis PA

Answer 2

L: lateral supra-epicondylar ridge of humerus
B: lateral epicondyle of humerus (common extensor tendon)

Question 3

extensor carpi radialis longus & brevis nerve innervation

Answer 3

radial nerve C6, C7, C8

Question 4

extensor carpi radialis longus & brevis DA

Answer 4

L: base of 2nd metacarpal
B: base of 3rd metacarpal

Question 5

extensor digitorum action

Answer 5

digits 2-5 extension at MCP and IP joints

Question 6

extensor digitorum DA

Answer 6

extensor expansions of digits 2-5

Question 6

extensor digitorum PA

Answer 6

lateral epicondyle of humerus (common extensor tendon)

Question 7

extensor digitorum nerve innervation

Answer 7

radial nerve (deep branch) C7, C8

Question 8

extensor digiti minimi action

Answer 8

5th digit extension at MCP and IP

Question 9

extensor digiti minimi PA

Answer 9

lateral epicondyle of humerus (common extensor tendon)

Question 10

extensor digiti minimi nerve innervation

Answer 10

radial nerve (deep branch) C7, C8

Question 11

extensor digiti minimi DA

Answer 11

extensor expansion of 5th digit

Question 12

extensor carpi ulnaris action

Answer 12

wrist extension
wrist ulnar deviation
active during fist clenching

Question 13

extensor carpi ulnaris PA

Answer 13

lateral epicondyle of humerus (common extensor tendon)

Question 13

extensor carpi ulnaris DA

Answer 13

base of 5th metacarpal

Question 14

extensor carpi ulnaris nerve innervation

Answer 14

radial nerve (deep branch) C7, C8

Question 15

extensor indicis action

Answer 15

2nd digit extension at MCP joint
may assist with wrist extension

Question 16

extensor indicis PA

Answer 16

posterior ulna and interosseous membrane

Question 17

extensor indicis DA

Answer 17

extensor expansion of 2nd digit

Question 18

extensor indicis nerve innervation

Answer 18

radial nerve (PIN) C7, C8

Question 19

abductor pollicis longus action

Answer 19

thumb radial abduction at CMC joint
thumb extension at CMC joint

Question 20

abductor pollicis longus PA

Answer 20

posterior surface of:
ulna
radius
interosseous membrane

Question 21

abductor pollicis longus DA

Answer 21

base of 1st metacarpal

Question 22

abductor pollicis longus nerve innervation

Answer 22

radial nerve (PIN) C7, C8

Question 23

extensor pollicis brevis & longus action

Answer 23

thumb extension at CMC and MCP joints
EPL only: thumb extension at IP joint

Question 24

extensor pollicis brevis & longus PA

Answer 24

EPB: posterior radius and interosseous membrane
EPL: posterior ulna and interosseous membrane

Question 25

extensor pollicis brevis & longus DA

Answer 25

EPB: base of proximal phalanx of thumb
EPL: base of distal phalanx of thumb

Question 26

extensor pollicis brevis & longus nerve innervation

Answer 26

radial nerve (PIN) C7, C8