Hand Musculature Flashcards
Abductor Pollicis Brevis
O-Scaphoid, trapezium and flexor retinaculum
I-Later base of proximal phalanx of thumb
N-Median nerve
A-Abducts thumb and helps oppose it
Flexor Pollicis Brevis
O-Capitate, trapezium and flexor retinaculum
I-Lateral base of proximal phalanx of thumb
N-Median nerve
A-Flexes thumb
Opponens Pollicis
O-Scaphoid, trapezium and flexor retinaculum
I-Lateral side of metacarpal of thumb
N-Median nerve
A-Opposition of the thumb; medially rotates thumb metacarpal
Adductor Pollicis
O-Oblique head- capitate and bases of 2nd and 3rd metacarpals
Transverse head- 3rd metacarpal
I-Medial base of proximal phalanx of thumb
N-Ulnar nerve
A-Adduction of the thumb (back to resting position)
Abductor Digiti Minimi
O-Pisiform bone
I-Medial base of proximal phalanx of little finger
N-Ulnar nerve
A-Abducts little finger
Flexor Digiti Minimi
O-Hook of hamate and flexor retinaculum
I-Medial base of proximal phalanx of little finger
N-Ulnar nerve
A-Flexes little finger
Opponens Digiti Minimi
O-Hook of hamate and flexor retinaculum
I-Medial side of metacarpal of little finger
N-Ulnar nerve
A-Rotates little finger into opposition to thumb
Lumbricals (4)
O-Tendons of flexor digitorum profundus I-Lateral sides of extensor expansions of fingers N-Median nerve- digits 2 & 3 Ulnar Nerve- digits 4 & 5 A-Flexes fingers at MP joint Extends at IP joint
Dorsal Interossei (4)
O-Adjacent metacarpals (bipennate)
I-Base of proximal phalanx and extensor expansions of digits 2-4
N-Ulnar nerve
A-Abducts fingers and assists lumbricals in flexion at MP joints and extension at IP
Palmar Interossei (3)
O-2nd, 4th, and 5th metacarpal bones
I-Base of proximal phalanx and extensor expansions of digits 2, 4, & 5
N-Ulnar nerve
A-Adduct fingers and assists lumbricals in flexion at MP joints and extension at IP
