Hand Muscles Flashcards
Thenar group:
- flexor pollicis brevis (FPB)
- abductor pollicis brevis (APB)
- opponens pollics (OP)
Hypothenar group:
- flexor digiti minimi brevis (FDMB)
- abductor digiti minimi (ADM)
- opponens digiti minimi (ODM)
Other Intrinsics:
- Adductor Pollicis
- Lumbricals
- Interossei
Abductor Pollicis Brevis (APB):
o: flexor retinaculum, scaphoid & trapezium
i: lateral aspect prox phalanx
a: abducts thumb @ CMC joint
N: median N
Opponens Pollicis (OP):
o: flexor retinaculum, scaphoid & trapezium
i: lat aspect 1st metacarpal
a: opposes thumb @ CMC
N: median N
Flexor Pollicis Brevis (FPB):
o: flexor retinaculum, scaphoid & trapezium
i: prox phalanx
a: flex thumb @ CMC/ MCP joints
N: median N
Adductor Pollicis
o: base of 2nd & 3rd metacarpal (oblique head) & anterior surface of 3rd metacarpal (transverse head)
i: medial base 1st prox phalanx
a: adducts thumb @ CMC joint
N: Ulnar N
Abductor Digiti Minimi Brevis
o: pisiform
i: medial 5th prox phalanx
a: abducts pinky @ MCP joint
N: ulnar N
Flexor Digiti Minimi Brevis (FDMB):
o: hamate & flexor retinaculum
i: base 5th prox phalanx
a: flex pinky finger @ MCP
N: ulnar N
Lumbricals
o: tendons of flexor digitorum profundus for 2-5 digits
i: extensor expansion digits 2-5
a: flexes @ MCPs, extends @ PIP & DIPS of digits 2-5
N: median N (1&2); ulnar N (3&4)
Dorsal Interossei (DAB):
o: adj metacarpals
i: bases of prox phalanges & extensor expansion of digits 2-4
a: abd fingers 2-4 @ MCP
N: unlar N
Palmar Interossei
o: 2nd, 4th, 5th, metacarpals
i: bases prox phalanges of digits 2, 4, 5 & extensor expansion
a: adducts fingers 2, 4 & 5 @ MCP joints
N: ulnar N
opponens digiti minimi (ODM):
o: hamate & flexor retinaculum
i: medial 5th mc
a: opposes 5th digit @ CMC joint
N: ulnar N
