Instrinsic Muscles of the Hand

Question 1

Opponens Pollicis - Origin

Answer 1

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 2

Opponens Pollicis - Insertion

Answer 2

Lateral side of 1st metacarpal

Question 3

Opponens Pollicis - Innervation

Answer 3

Recurrent branch of median nerve (C8, T1)

Question 4

Opponens Pollicis - Action(s)

Answer 4

To oppose thumb

Draws 1st metacarpal medially to center of palm and rotates it medially

Question 5

Abductor Pollicis Brevis - Origin

Answer 5

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 6

Abductor Pollicis Brevis - Insertion

Answer 6

Lateral side of base of proximal phalanx of thumb

Question 7

Abductor Pollicis Brevis - Innervation

Answer 7

Recurrent branch of median nerve (C8, T1)

Question 8

Abductor Pollicis Brevis - Action(s)

Answer 8

Abducts thumb

Helps to oppose thumb

Question 9

Flexor Pollicis Brevis - Origin
Superficial head
Deep head

Answer 9

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 10

Flexor Pollicis Brevis - Insertion
Superficial head
Deep head

Answer 10

Lateral side of base of proximal phalanx of thumb

Question 11

Flexor Pollicis Brevis - Innervation
Superficial head
Deep head

Answer 11

Superficial head - Recurrent branch of median nerve (C8, T1)

Deep head - Deep branch of ulnar nerve (C8, T1)

Question 12

Flexor Pollicis Brevis - Action(s)
Superficial head
Deep head

Answer 12

Flexes Thumb