Hand Anatomy FULL

Question 1

Abductor Pollicis Brevis

Answer 1

O: scaphoid, trapezium & flexor
I: proximal phalanx & extensor hood of thumb
N: recurrent branch of median nerve (C8, T1)
A: thumb abduction at MCP

Question 2

Flexor Pollicis Brevis

Answer 2

O: trapezium & flexor retinaculum
I: proximal phalanx of thumb
N: recurrent branch median nerve (C8, T1)
A: thumb flexion at MCP (CMC?)

Question 3

Opponens Pollicis

Answer 3

O: trapezium & flexor retinaculum
I: 1st metacarpal
N: recurrent branch median nerve (C8, T1)
A: medially rotate thumb

Question 4

Abductor Digiti Minimi

Answer 4

O: pisiform & tendon of flexor carpi ulnaris
I: proximal phalanx of little finger
N: deep branch ulnar nerve (C8, T1)
A: abducts little finger at MCP

Question 5

Flexor Digiti Minimi

Answer 5

O: hook of hamate & flexor retinaculum
I: proximal phalanx of little finger
N: deep branch ulnar nerve (C8, T1)
A: flexes little finger at MCP

Question 6

Opponens Digiti Minimi

Answer 6

O: Hook of hamate & flexor retinaculum
I: medial aspect of metacarpal 5
N: deep branch ulnar nerve (C8, T1)
A: laterally rotates metacarpal 5

Question 7

Palmaris brevis

Answer 7

O: palmar aponeurosis & flexor retinaculum
I: dermis of skin
N: ulnar nerve (C8, T1)
A: improves grip

Question 8

Adductor Pollicis

Answer 8

O: transverse head- metacarpal 3
oblique head- capitate & base metacarpal 2&3
I: base of proximal phalanx & extensor hood of thumb
N: ulnar nerve (C8, T1)
A: adducts thumb

Question 9

Lumbricals

Answer 9

O: tendons of flexor digitorum profundus
I: extensor hoods of finger 2-5
N: lateral 2: median nerve
medial 2: ulnar nerve
A: MCP flexion while maintaining IP extension