Hand

Question 1

Abductor Pollics Brevis

Answer 1

Origin: Tubercles of scaphoid & trapezium, flexor retinaculum
Insertion: Later aspect of base of proximal phalanx of the thumb
Action: Abduct thumb @ carpometacarpal joint
Innervation: Recurrent branch of median n.

Question 2

Flexor Pollicis Brevis

Answer 2

Origin: Tubercle of trapezium, palmar aspect of capitate & trapezoid, flexor retinaculum
Insertion: Lateral aspect of base of proximal phalanx of the thumb
Action: Thumb flexion
Innervation:
* Superficial head: recurrent branch of median n.
* Deep head: deep branch of ulnar n.

Question 3

Adductor Pollicis

Answer 3

Origin:
* Oblique head: Palmar aspect of capitate, base of 2nd & 3rd metacarpal
* Transverse head: Palmar aspect of body of 3rd metacarpal

Insertion: Medical aspect of base of proximal phalanx of the thumb
Action: Adduct thumb @ carpometacarpal joint
Innervation: Deep branch of ulnar n.

Question 4

Palmaris Brevis

Answer 4

Origin: Palmar aponeurosis & flexor retinaculum
Insertion: Skin along medial margin of hand
Action: Wrinkles skin on hypothenar eminence, deepens hollow on hand, helps in gripping
Innervation: Superficial branch of ulnar n.

Question 5

Abductor Digiti Minimi

Answer 5

Origin: Pisiform, tendon of flexor carpi ulnaris
Insertion: Medial aspect of base of proximal phalanx of digit 5
Action: Abduct 5th @ metacarpophalangeal joint
Innervation: Deep branch of ulnar n.

Question 6

Lumbricals

Answer 6

Origin: Tendons of associated flexor digitorum profundus
Insertion: Later aspect of associated extensor expansion
Action: Simultaneously flex MCP joints & extend IPJs
Innervation: Deep branch of ulnar

Question 7

Opponens Pollicis

Answer 7

Origin: Tubercle of trapezium & flexor retinaculum
Insertion: Anterolateral aspect of body of first metacarpal
Action: Opposes thumb towards other fingers
Innervation: Recurrent branch of median n.

Question 8

Flexor Digiti Minimi

Answer 8

Origin: Hook of hamate, flexor retinaculum
Insertion: Medial aspect of base of proximal phalanx of 5th
Action: Flexsion of 5th @ MCP joint
Innervation: Deep branch of ulnar n.

Question 9

Opponens Digiti Minimi

Answer 9

Origin: Hook of hamate, flexor retinaculum
Insertion: Medial aspect of 5th metacarpal
Action: Opposes 5th towards the thumb
Innervation: Deep branch of ulnar n.

Question 10

Dorsal Interossei (DAB)

Answer 10

Origin: Medial & lateral aspect of adjacent metacarpal
Insertion:
* 1&2: lateral aspect of proximal phalanx, extensor expansion
* 3&4: medial aspect of proximal phalanx, extensor expansion

Action: Abduct @ MCP joint, simultaneously flex MCP joints & extend IPJs
Innervation: Deep branch of ulnar n.

Question 11

Palmar Interossei (PAD)

Answer 11

Origin: Palmar aspect of digits 2, 4, 5
Insertion:
* 2&4: Lateral aspect of base of proximal phalanx
* 5: Medial aspect of base of proximal phalanx

Action: Adducts @ MCP joint, simultaneously flex MCP joint & extend IPJs
Innervation: Deep branch of ulnar n.