Muscles of Hand Flashcards
abductor pollicis brevis (APB) proximal attachment
flexor retinaculum and tubercles of scaphoid and trapezium
APB distal attachment
lateral side of base of proximal phalanx of thumb
APB innervation
recurrent branch of median nerve (C8, T1)
APB muscle action
abducts thumb, helps oppose it
Flexor pollicis brevis (FPB) superficial head and deep head proximal attachment
flexor retinaculum and tubercles of scaphoid and trapezium (same as APB)
FPB superficial head and deep head distal attachment
lateral side of base of proximal phalanx of thumb (same as APB)
FPB superficial head innervation
recurrent branch of median nerve (C8, T1)
FPB deep head innervation
deep branch of ulnar nerve (C8, T1)
opponens pollicis proximal attachment
flexor retinaculum and tubercles of scaphoid and trapezium (same as APB and FPB)
opponens pollicis distal attachment
lateral side of 1st metacarpal
opponens pollicis innervation
recurrent branch of median nerve (C8, T1)
opponens pollicis muscle action
oppose thumb, draws 1st metacarpal medially to center of palm and rotates it medially
adductor pollicis oblique head proximal attachment
base of 2nd and 3rd metacarpal, capitate and adjacent carpals
adductor pollicis transverse head proximal attachment
anterior surface of shaft of 3rd metacarpal
adductor pollicis oblique and transverse head distal attachment
medial side of base of proximal phalanx of thumb
adductor pollicis innervation
deep branch of ulnar nerve (C8, T1)
adductor pollicis muscle action
adducts thumb toward lateral border of palm
dorsal interossei muscles 1-4 proximal attachment
adjacent side of two metacarpals
dorsal interossei 1-4 distal attachment
bases of proximal phalanges; extensor expansions of digits 2-4
dorsal interossei 1-4 innervation
deep branch of ulnar nerve (C8, T1)
dorsal interossei 1-4 muscle action
abduct digits 2-4 from axial line; act with lumbricals to flex metacarpophlangeal joints and extending interphalangeal joints
palmar interossei 1-3 proximal attachment
palmar surfaces of metacarpals 2,4,5
palmar interossei 1-3 distal attachment
bases of proximal phalanges, extensor expansions of digits 2,4,5
palmar interossei innervation
deep branch of ulnar nerve (C8, T1)
palmar interossei 1-3 muscle action
adduct 2,4,5 digits toward axial line. assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints; extensor expansions of 2-4 digits
1st and 2nd lumbrical proximal attachment
lateral two tendons of flexor digitorum profundus
1st and 2nd lumbrical distal attachment
lateral sides of extensor expansions of 2nd and 5th digits
1st and 2nd lumbrical innervation
median nerve (C8, T1)
1st and 2nd lumbrical muscle action
flex metacarpophalangeal joints; extend interphalangeal joints of 2nd and 5th digits
abductor digiti minimi (ADM) proximal attachment
pisiform
ADM distal attachment
medial side of base of proximal phalanx of 5th digit
ADM innervation
deep branch of ulnar nerve (C8, T1)
ADM muscle action
abducts 5th digit, assists in flexion of its proximal phalanx
flexor digiti minimi (FDM) brevis proximal attachment
hook of hamate and flexor retinaculum
FDM brevis distal attachment
medial side of base of proximal phalanx of 5th digit
FDM brevis innervation
deep branch of ulnar nerve (C8, T1)
FDM brevis muscle action
flexes proximal phalanx of 5th digit
opponens digiti minimi (ODM) proximal attachment
hook of hamate and flexor retinaculum
ODM distal attachment
medial border of 5th metacarpal
ODM innervation
deep branch of ulnar nerve (C8, T1)
what runs through the guyon’s tunnel?
ulnar nerve and ulnar artery
floor of guyon’s tunnel
flexor retinaculum
roof of guyon’s tunnel
volar carpal ligament
