Intrinsic Muscles of Hands (Short Muscles)

Question 0

Insertion of Lumbricals 1 and 2

Answer 0

Lateral Sides of extensor expansions of 2nd-5th fingers

Question 1

Origin of Lumbricals 1 and 2

Answer 1

Lateral two tendons of flexor digitorum produndus(as unipennate muscles)

Question 2

Innervation of Lumbricals 1 and 2

Answer 2

Median Nerve (C8, T1)

Question 3

Action Lumbricals 1 and 2

Answer 3

Flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th fingers

Question 4

Origin of Lumbricals 3 and 4

Answer 4

Medials three tendons of flexor Digitorum Profundus(as bipennnate muscles)

Question 5

Insertion of Lumbricals 3 and 4

Answer 5

Lateral sides of extensor expansions of 2nd-5th fingers

Question 6

Innervation of lumbricals 3 and 4

Answer 6

Deep branch of ulnar nerve (C8,T1)

Question 7

Action of Lumbricals 3 and 4

Answer 7

Flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th fingers

Question 8

Origin of Dorsal interossei, 1-4

Answer 8

Adjacent sides of two metacarpals (as bipennate muscles)

Question 9

Insertion of Dorsal Interossei, 1-4

Answer 9

Bases of proximal phalanges; extensor expansions of 2nd-4th fingers

Question 10

Innervation of Doral Interossei, 1-4

Answer 10

Deep Branch of ulnar nerve( C8, T1)

Question 11

Action of Dorsal interossei, 1-4

Answer 11

Abduct 2nd-4th fingers from axial line; act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

Question 12

Origin of Palmar interossei, 1-3

Answer 12

Palmar surfaces of 2nd, 4th, and 5h metacarpals (as unipennate muscles)

Question 13

Insertion of Palmar interossei, 1-3

Answer 13

Base of proximal phalanges; extensor expansions of 2nd, 4th, and 5th fingers

Question 14

Innervation of Palmar interossei, 1-3

Answer 14

Deep branch of ulnar nerve(C8, T1)

Question 15

Action of Palmar interossei, 1-3

Answer 15

Adduct 2nd, 4th, and 5th fingers toward axial line, assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints