Muscles of the Intrinsic Hand

Question 1

Abductor Pollicis Brevis

Answer 1

O : Flexor retinaculum, trapezium and scaphoid tubercles
I : radial side of the base of the proximal phalanx of the thumb and the dorsal digital expansion
A : Abducts the thumb at the CMC joint

Question 2

Flexor Pollicis Brevis

Answer 2

O : Flexor retinaculum and trapezium
I : Radial side of the base of proximal phalanx of the thumb
A : Flexes the thumb at the CMC and MCP

Question 3

Opponens Pollicis

Answer 3

O : Flexor retinaculum and tubercle of the trapezium
I : Anterior surface and radial (lateral) border of the 1st metacarpal
A : Opposition of thumb at the CMC

Question 4

Adductor Pollicis

Answer 4

O (Oblique Head) : Anterior bases of the 2nd and 3rd metacarpals and the capitate
O (Transverse Head) : Distal 2/3 of the anterior surface of the 3rd metacarpal
I : Ulnar side of the base of the proximal phalanx of thumb and dorsal digital expansion
A : Adducts the thumb at the CMC joint

Question 5

Opponens Digiti Minimi

Answer 5

O : Flexor retinaculum and hook of hamate
I : Anterior surface and ulnar (medial) border of the 5th metacarpal
A : Opposes the 5th digit at the CMC joint

Question 6

Abductor Digiti Minimi Manus

Answer 6

O : Pisiform and flexor carpi ulnaris tendon
I : Ulnar side of the base of the proximal phalanx of the 5th digit and dorsal digital expansion
A : Abducts the 5th digit at the MCP joint

Question 7

Flexor Digiti Minimi Manus

Answer 7

O : Flexor retinaculum and hook of hamate
I : Ulnar side of the base of the proximal phalanx of the 5th digit
A : Flexes the 5th digit at the MCP joint