Muscles of the Hand Flashcards
What are the thenar muscles
Opponens pollicis
Abductor pollicis brevis
Flexor pollicis brevis
What is the innervation of the thenar muscles
Median nerve
What are the hypothenar muscles
Opponens digiti mimini
Abductor digiti minimi
Flexor digiti minimi brevis
What is the innervation of the hypothenar muscles
Ulnar nerve
What is the innervation of the lumbricals
Median nerve = lateral two lumbricals
Ulnar nerve = medial two lumbricals
Innervation of adductor pollicis
Ulnar nerve
Action of opponens pollicis
Opposes thumb
- medially rotates and flexes metacarpal on trapezium
Action of abductor PB
abducts thumb
Action of flexor PB
Flexes MPC joint of thumb
Action of opponens DM
Laterally rotates metacarpal of little finger towards palm
Action of abductor DM
Abducts little finger
Action of flexor digit mimimi brevis
Flexes MCP of little finger
Action of lumbricals
Flex at MCP joint
Extend at IP joints
Action of dorsal interossei
Abduct fingers at MCP joint
Action of palmar interossei
Adduct fingers at MCP joint
