Hand Muscles Flashcards
What are the attachments of the palmaris brevis
proximal: dermis hypothenar region
distal: palmar aponeurosis & flexor retinaculum
what is the torque of the palmaris brevis
wrinkles skin on ulnar side
improves grip
what innervates and supplies blood to the palmaris brevis
superficial branch ulnar
superficial palmar arch
what are the attachments of the Oppens Pollicis
proximal: flexor retinaculum & tubercles of scaphoid & trapezium
distal: lateral side of 1st metacarpal
what is the torque of the Oppens Pollicis
opposes thumb: pulls 1st metacarpal to center of palm & rotates thumb medially
what is the innervation and blood supply to the Oppens Pollicis
recurrent (thenar) branch of Median Nerve (C8, T1) & superficial palmar branch of radial artery
what are the attachments of the abductor pollicis brevis
proximal: flexor retinaculum & tubercles of scaphoid and trapezium
distal: lateral side of base and proximal phalanx of thumb
what is the torque of the abductor pollicis brevis
thumb abductor & helps oppose it
what is the innervation and blood supply to the abductor pollicis brevis
thenar branch of Median Nerve & superficial palmar branch of the radial artery
what are the attachments of the flexor pollicis brevis
proximal: flexor retinaculum & tubercles of scaphoid and trapezium
distal: proximal side of base and proximal phalanx of thumb
what is the torque of the flexor pollicis brevis
thumb flexor
what is the innervation and blood supply to the flexor pollicis brevis
thenar branch of median nerve & superficial palmar branch of radial artery
what are the 3 thenar muscles
abductor pollicis brevis
opponens pollicis
flexor pollicis brevis
what are the 3 hypothenar muscles
abductor digiti minimi
flexor digiti minimi
opponens digiti minimi
what are the attachments of the flexor digiti minimi brevis
proximal: hook of hamate & flexor retinaculum
distal: medial side of base of proximal phalanx of 5th digiti
what is the torque of the flexor digiti minimi brevis
flexor proximal phalanx of 5th digiti
what innervates and supplies blood to the flexor digiti minimi brevis
deep branch of ulnar nerve and ulnar artery
what are the attachments of the abductor digiti minimi
proximal: pisiform
distal: medial side of base of proximal phalanx of digit 5
what is the torque of the abductor digiti minimi
abductor of the 5th finger
what innervates and supplies blood to the abductor digiti minimi
deep branch of ulnar nerve & ulnar artery
what are the attachments of the opponens digiti minimi
proximal: hook of hamate & flexor retinaculum
distal: medial boarder of the 5th metacarpal
what is the torque of the opponens digiti minimi
draws 5th metacarpal anteriorly & rotates it
what innervates and supplies blood to the opponens digiti minimi
deep branch of ulnar nerve and ulnar artery
what are the attachments of the adductor pollicis
medial: 3rd metacarpal & capitate
lateral: medial side of base and proximal phalanx of thumb
what is the torque of the adductor pollicis
adductor on thumb when abducted
oppose thub by 1st metacarpal adductor with medial rotator
what is the innervation and blood supply to the adductor pollicis
deep branch of ulnar nerve & deep palmar arterial arch
what are the attachments of the lumbricals
proximal: tendon of flecor digitorum profundus
distal: extensor expansion (hood)
what is the torque of the lumbricals
flexor on MCP joint & extensor on IP joint
what are the innervations of the lumbricals
3rd & 4th deep branch of ulnar
1st & 2nd median nerve
what provides blood supply to the lumbricals
superficial palmar arch
common palmar digital arteries
deep palmar arch
dorsal digital artery
what are the attachments of the dorsal interosseous muscles (DABs)
proximal: dorsal 1-4 - adjacent sides of two metacarpals
distal: extensor hood & base f proximal phalange of digits 2-4
what is the torque of the dorsal interosseous muscles (DABs)
abductor on digits from axial line
assist lumbricals as flexor MCP joint & extensor
what innervates and supplies blood to the dorsal interosseous muscles
deep branch of ulnar nerve & dorsal and palmar metacarpal artery
what are the attachments of the palmar interosseous muscles (PADs)
proximal: palmar surfaces of 2nd, 4th and 5th metacarpals
distal: extensor hood & base of proximal phalange of digits 2,4 & 5
what is the torque of the palmar interosseous muscles (PADs)
adductor on digits
assist lumbricals as flexor MCP joint & extensor IP joint
what innervates and supplies blood to the palmar interosseous muscles
deep branch of ulnar nerve and palmar metacarpal arteries
