Wrist

Question 1

What innervates the superficial structures in the palm and what action does it provide?

Answer 1

Superficial branch of ulnar nerve; wrinkles and tenses the skin over the hypothenar eminence.

Question 2

Flexor retinaculum insertions?

Answer 2

Attaches medically to hook of hamate and pisiform. Laterally attaches to scaphoid and trapezium.

Question 3

What is the roof of the carpal tunnel?

Answer 3

Flexor retinaculum.

Question 4

Lateral boundary of carpal tunnel?

Answer 4

Tubercles of scaphoid and trapezium.

Question 5

Medial border of carpal tunnel?

Answer 5

Hook of hamate and pisiform.

Question 6

Floor of carpal tunnel?

Answer 6

Palmar ulnocarpal and radiocarpal ligaments.

Question 7

Origin and insertion of abductor pollicis brevis?

Answer 7

Origin: flexor retinaculum and tubercle of trapezium.
Inserts: base of proximal phalanx of thumb.

Question 8

Innervation and consequent action of abductor pollicis brevis?

Answer 8

Innervated by recurrent branches of the median nerve to abduct the thumb.

Question 9

Origin and insertion of flexor pollicis brevis?

Answer 9

Origin: deep head originates off trapezoid and capitate. Superficial head originates from flexor retinaculum and tubercle of trapezium.

Question 10

What is innervation and action of flexor pollicis brevis?

Answer 10

Innervated by recurrent branch of the median nerve and flexes the carpometacarpal and metacarpophalangeal joint of thumb.

Question 11

Origin and insertion of opponens pollicis?

Answer 11

Origin: flexor retinaculum, scaphoid and trapezium.
Inserts on entire length of lateral border of metacarpal bone.

Question 12

Innervation and action of opponens pollicis?

Answer 12

Innervated by recurrent branches of median nerve and occasionally also deep branch of ulnar nerve. Action is thumb opposition to other fingers.

Question 13

Abductor digiti minimi origin and insertion?

Answer 13

Origin: pisiform bone and tendon of flexor carpi ulnaris.
Insertion: base of proximal phalanx of 5th digit.

Question 14

Innervation and action of abductor digiti minimi?

Answer 14

Innervated by deep branch of the ulnar nerve and abducts pinky finger.

Question 15

Origin and insertion of flexor digiti minimi?

Answer 15

Origin: hamulus of hamate and flexor retinaculum.
Inserts on base of proximal phalanx of 5th digit.

Question 16

Innervation and action of flexor digiti minimi?

Answer 16

Innervated by deep branch of the ulnar nerve and flexes little finger.

Question 17

Opponens digiti minimi origin and insertion?

Answer 17

Origin: hamulus of hamate and flexor retinaculum.
Insertion: ulnar side of 5th metacarpal.

Question 18

What innervates opponens digiti minimi and what action does it perform as a result?

Answer 18

Deep branch of ulnar nerve innervates and action is brining pinky finger into opposition with thumb.

Question 19

Lumbricals origin and insertion?

Answer 19

Origin: four tendons of flexor digitorum profundus.
Insertion: radial side of dorsal digital expansion of the 2nd-5th digits.

Question 20

Innervation and action of lumbricals?

Answer 20

Median nerve innervates radial two and deep branch of the ulnar nerve supplies ulnar two.