Hand

Question 1

Lumbricals origin and insertion

Answer 1

Origin- surfaces of flexor Digitorum Profundus tendons

Insertion- extensor aponeurosis on dorsal surface of phalanges 2-5

Question 2

Lumbricals action

Answer 2

Extend the second through fifth fingers at interphalangeal joints;
Flex the second through fifth fingers at the metacarpophalangeal joint

Question 3

Palmar Interossei origin and insertion

Answer 3

Origin- base of first, second, fourth and fifth metacarpals

Insertion- base of proximal phalanx of related finger and extensor aponeurosis

Question 4

Palmar interossei action

Answer 4

Abduct the second, third, fourth, fingers at metacarpophalangeal joints
Assist to flex the second, third, and fourth fingers at the metacarpophalangeal and extend at the interphalangeal joints