Hand intrinsic muscles

Question 1

Dorsal interossei Origin

Answer 1

Adjacent sides of two metacarpal bones

Question 2

Dorsal interossei insertion

Answer 2

Base of proximal phalanges, extensor expansion of digits 2-4

Question 3

Dorsal interossei action

Answer 3

Adbuct digits from axial ling of hand (3rd digit); flex digits at metocarpophalangeal joints and extend interphalangeal joints

Question 4

Dorsal interossei innervation

Answer 4

Ulnar nerve (deep branch)

Question 5

Dorsal interossei blood supply

Answer 5

deep palmar arch

Question 6

Palmar interossei origin

Answer 6

Sides of metacarpals 2,4 and 5

Question 7

Palmar interossei Insertion

Answer 7

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

Question 8

Palmar interossei action

Answer 8

Adducts digits towards axial line of hand (3rd digit) Flexes digits at metacarpophalangeal joint and extends interphalangeal joints

Question 9

Palmar interossei innervation

Answer 9

Ulnar nerve (deep branch)

Question 10

Palmar interossei blood supply

Answer 10

deep palmar arch

Question 11

Lumbricals origin

Answer 11

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

1st and 2nd: lateral sides of the 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

Extend digits at interphalangeal joints, flex metacarpophalangeal joints

Question 14

Lumbricals innervation

Answer 14

Ulnar nerve (deep branch)

Question 15

Lumbricals blood supply

Answer 15

Superficial and deep palmar arches