Flexors pt 2

Question 1

Opponens digiti minimi

Answer 1

Origin - Hook of hamate bone, flexor retinaculum
Insertion- Ulnar aspect of metacarpal bone 5
Action - Finger flexion, finger lateral rotation/opposition
Innervation - Deep branch of ulnar nerve (C8, T1)

Question 2

Flexor digiti minimi brevis

Answer 2

Origin: Hook of hamate bone and flexor retinaculum
Insertion: Medial side of the base of the proximal phalanx of the little finger
Action: Flexion of the little finger at the metacarpophalangeal joint
Innervation: Deep branch of the ulnar nerve

Question 3

Abductor digiti minimi

Answer 3

Origin: Pisiform bone
Insertion: Medial side of the base of the proximal phalanx of the little finger
Action: Abducts the little finger
Innervation: Deep branch of the ulnar nerve (C8-T1)

Question 4

Flexor pollicis brevis

Answer 4

Origin -
Superficial head: Flexor retinaculum and trapezium bone
Insertion-Lateral aspect of base of proximal phalanx 1
Action -Thumb flexion
Innervation - Superficial head: Recurrent branch of median nerve

Question 5

Opponens pollicis

Answer 5

Origin: trapezium bone and flexor retinaculum
Insertion: Lateral side of the first metacarpal bone
Action: Thumb opposition
Innervation: Recurrent branch of the median nerve

Question 6

Abductor pollicis brevis

Answer 6

Origin -scaphoid and trapezium bones
Insertion- Lateral aspect of base of proximal phalanx 1
Action -Thumb abduction
Innervation - recurrent branch of the medial nerve

Question 7

Adductor pollicis

Answer 7

Origin - transverse head: Palmar base of metacarpal bone 2 and 3
Insertion- Medial base of proximal phalanx 1
Action - Thumb adduction
Innervation - deep branch of the ulnar nerve

Question 8

Lumbricals

Answer 8

Origin: Tendons of the flexor digitorum profundus
Insertion: middle phalanx 2-5
Action: Flexion at the metacarpophalangeal joint, extension at the interphalangeal joints
Innervation:
Lateral two lumbricals: Median nerve
Medial two lumbricals: Deep branch of the ulnar nerve

Question 9

Interossei (palmer/dorsal)

Answer 9

Origin: Lateral and medial surfaces of the metacarpal bones.
Insertion: Base of the proximal phalanx and extensor expansion of the finger.
Action:
Palmar Interossei: Adduction of fingers
Dorsal Interossei: Abduction of fingers
Innervation: Deep branch of the ulnar nerve