Hand Intrinsic Muscles

Question 1

Dorsal Interossei
(Origin)

Answer 1

Origin: Adjacent Sides of Two Metacarpal Bones

Question 2

Dorsal Interossei
(Insertion)

Answer 2

Insertion: Base of Proximal Phalanges, Extensor Expansion of Digits 2-4

Question 3

Dorsal Interossei
(Action)

Answer 3

Action: Abduct Digits from Axial Line of hand (3rd digit): Flex digits at metacarpophalangeal joint and extend interphalangeal joints

Question 4

Dorsal Interossei
(Innervation)

Answer 4

Innervation: Ulnar Nerve (Deep Branch)

Question 5

Dorsal Interossei
(Blood Supply)

Answer 5

Blood Supply: Deep Palmar Arch

Question 6

Palmar Interossei
(Origin)

Answer 6

Origin: Sides of Metacarpals 2,4,and 5

Question 7

Palmer Interossei
(Insertion)

Answer 7

Insertion: Bases of proximal phalanx and
extensor expansion of digits 2, 4,
and 5

Question 8

Palmer Interossei
(Action)

Answer 8

Adducts digits toward axial line of
hand (3rd digit); flexes digits at
metacarpophalngeal joint and
extends interphalangeal joints

Question 9

Palmer Interossei
(Innervation)

Answer 9

Innervation: Ulnar Nerve (Deep Branch)

Question 10

Palmer Interossei
(Blood Supply)

Answer 10

Blood Supply: Deep Palmar Arch

Question 11

Lumbricals
(Origin)

Answer 11

Origin: 1st and 2nd: Lateral two
tendons of flexor
digitorum profundus. 3rd
and 4th: Medial three
tendons of flexor
digitorum profundus

Question 12

Lumbricals
(Insertion)

Answer 12

Insertion: 1st and 2nd: Lateral sides of
extensor expansion of digits 2
and 3. 3rd and 4th: Lateral sides
of extensor expansion of digits 4
and 5

Question 13

Lumbricals
(Action)

Answer 13

Action: Extend digits at interphalangeal
joints, flex metacarpophalangeal
joints

Question 14

Lumbricals
(Innervation)

Answer 14

Innervation: Ulnar Nerve (Deep Branch)

Question 15

Lumbricals
(Blood Supply)

Answer 15

Blood Supply: Superficial and Deep Palmer Arches