Posterior compartment- Superficial muscles

Question 1

Insertion of extensor digitorum?

Answer 1

Dorsal digital expansion of 2nd to 5th digits

Question 2

Innervation of all superficial muscles in posterior compartment? (extensor digitorum, extensor digiti minimi, extensor carpi ulnaris)

Answer 2

Radial n.

C7, C8

Question 3

Action of extensor digitorum?

Answer 3

Wrist: extension

MCP, PIP, DIP of 2nd to 5th digits: extension/abduction of fingers

Question 4

Insertion of extensor digiti minimi?

Answer 4

Dorsal digital expansion of 5th digit

Question 5

Action of extensor digit minimi?

Answer 5

Wrist: extension, ulnarabduction of hand

MCP, PIP, DIP of 5th digit: extension and abduction of 5th digit

Question 6

Origin of extensor carpi ulnaris?

Answer 6

Common head (lateral epicondyle of humerus)
Ulnar head (dorsal surface)

Question 7

Insertion of extensor carpi ulnaris?

Answer 7

Base of 5th metacarpal

Question 8

Action of Extensor carpi ulnaris?

Answer 8

Wrist: extension, ulnar deviation of hand

Question 9

Origin of extensor digitorum and extensor digiti minimi?

Answer 9

Common head (lateral epicondyle of humerus)