muscles of the hand Flashcards
(27 cards)
Opponens pollicis proximal and distal attachment
proximal: flexor retinaculum and tubercles of scaphoid and trapezium
distal: lateral side of 1st metacarpal
thenar muscles?
opponens pollicis, abductor pollicis brevis, flexor pollicis brevis, adductor pollicis
Abductor pollicis brevis proximal and distal attachment
Proximal: Flexor retinaculum and tubercles of scaphoid and trapezium
distal: Lateral side of base of proximal phalanx of thmub
Flexor pollicis brevis proximal and distal attachment
Proximal: flexor retinaculum and tubercle of scaphoid and trapezium
Distal: lateral side of base of proximal phalanx of thumb
Opponens pollicis innervation and actions
innervation: Recurrent branch of median nerve (C8, T1)
action: to oppose thumb, it draws 1st metacarpel medially to center of palm and rotates it Medially
Abductor pollicis brevis innervation and actions
Innervation: recurrent branch of median nerve C8, T1
action: Abducts thumb, helps oppose it
Flexor pollicis brevis innervation and actions
Innervation: Recurrent branch of median nerve C8, T1
Action: Flexes thumb
Abductor digit minimi innervation and actions
Innervation: Deep branch of ulnar nerve C8, T1
Action: Abducts 5th finger assists in flexion of its proximal phalanx
Flexor digiti minimi brevis innervation and actions
Innervation: deep branch of ulnar nerve C8, T1
action: Flexes proximal phalanx of 5th finger
Opponens digiti minimi innervation and actions
innervation: Deep branch of ulnar nerve C8, T1
Action: draws 5th metacarpal anterior and rotates it, bringing 5th finger into opposition with thumb
Abductor digiti minimi Proximal and distal attachment
Proximal: Pisiform
distal: Medial side of base of proximal phalanx of 5th finger
Flexor digiti minimi brevis Proximal and distal attachment
Proximal: Hook of hamate and flexor retinaculum
Distal: Medial side of base of proximal phalanx of 5th finger
Opponens digiti minimi Proximal and distal attachment
Proximal: Hook of hamate and flexor retinaculum
Distal: Medial border of 5th metacarpel
Short muscles?
Lumbricals, Dorsal interossei, palmar interossei
Lumbericals I and 2 Proximal and distal attachment
Proximal: Lateral two tendons of flexor digitorum profundus (as unipennate muscles)
Distal: Lateral sides of extensor expansions of 2nd-5th fingers
Lumbricals 3 and 4 Proximal and distal attachment
Proximal: medial three tendons of flexor digitorum profundus (as bipennate muscles)
Distal: Lateral sides of extensor expansions of 2nd-5th fingers
Dorsal interossei 1-4 Proximal and distal attachment
Proximal: Adjacent sides of 2 metacarpels (as bipennate muscles)
Distal: Bases of proximal phalanges; extensor expansions of 2nd-4th fingers
Palmar interossei 1-3 Proximal and distal attachment
Proximal: Palmar surfaces of 2nd, 4th, and 5th metacarpals (as unipennate muscles)
Distal: Bases of proximal phalanges; extensor expansions of 2nd, 4th, and 5th fingers
Lumbericals 1and 2, 3 and 4 (have the same innervation and actions)
Innervation: Median nerve C8, T1
Actions:Flex metacarpophalangeal joints, extend interphalangeal joints of 2nd-5th fingers
Dorsal interossei 1-4 and Palmar interossei 1-3 innervation (have the same innervation)
Deep branch of ulnar nerve C8, T1
Dorsal interossei 1-4 actions
Abducts 2nd-4th fingers from axial line, act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints
Palmar interossei 1-3 actions
Adduct 2nd, 4th, and 5th fingers toward axial line assist lumbericals in flexing metacarpophalangeal joints and extending interphalangeal joints
hypothenar muscles
abductor digit minimi, flexor digiti minimi brevis, opponens digiti minimi
Adductor pollicis Oblique head and transverse head proximal attachment
Oblique head: Bases of 2nd and 3rd metacarpals, capitate, adjacent carpals
Transverse Head: Anterior surface of shaft of 3rd metacarpals
