Muscles of Hand

Question 1

Dorsal interossei (4) ORIGIN

Answer 1

Adjacent sides of metacarpals

Question 2

Dorsal interossei (4) INSERTION

Answer 2

Proximal phalanx of 2nd, 3rd (two tendons on medial and lateral sides), & 4th digits and extensor expansion of same digits

Question 3

Dorsal interossei (4) ACTION

Answer 3

Abduct 2nd, 3rd, 4th digits; flex metacarpo-phalangeal (MP) and extend interphalangeal joints (PIP and DIP of same digits

Question 4

Dorsal interossei (4) NERVE

Answer 4

Ulnar, Deep branch

Question 5

Palmar interossei (4) ORIGIN

Answer 5

palmar surface of metacarpals 1, 2, 4, & 5 (Not 3)

Question 6

Palmar interossei (4) INSERTION

Answer 6

Proximal phalanx of digits 1,2, 4, & 5, & extensor expansion of same digits

Question 7

Palmar interossei (4) ACTION

Answer 7

Adduct digits 1, 2, 4, 5th ; flex metacarpo-phalangeal (MP) and extend interphalangeal joints (PIP & DIP) of same digits

Question 8

Palmar interossei (4) NERVE

Answer 8

Ulnar, Deep branch

Question 9

Lumbricals (4) ORIGIN

Answer 9

Tendons of flexor digitorum profundus

Question 10

Lumbricals (4) INSERTION

Answer 10

extensor expansions of digits 2-5

Question 11

Lumbricals (4) ACTION

Answer 11

Flex metacarpo-phalangeal and extend interphalangeal (PIP and DIP) joints

Question 12

Lumbricals (4) NERVE

Answer 12

2 lateral (1 & 2): Median ; 2 medial (3 & 4): Ulnar, Deep branch)