Instrinsic muscles Flashcards
Intrinsic muscles
originate and insert in the hand
Muscles of the Thenar Eminence
Flexor pollicis brevis, abductor pollicis brevis, opponens pollicis
Muscles of the Hypothenar eminence
Abductor digit minimi manus, flexor digiti minimi manus, oppenens digiti minimi
muscles of the central compartment
Adductor pollicis, lumbricals, palmar interossei, dorsal interossei
ABductor Pollicis Brevis attachment
Flexor Retinaculum,scaphoid & Trapezium ->
proximal phalanx of the thumb (lateral side)
Abductor pollicis brevis does what
Abducts the thumb @ CMC and MCP joint
Flexor Pollicis Brevis attachments
Flexor Retinaculum & Trapezium -> proximal phalanx of the thumb (lateral) radial side
what does the flexor pollicis Brevis do
Flexes the thumb (1st metacarpal) @ CMC and MCP joint
Opponens Pollicis attachments
Flexor Retinaculum & trapezium -> entire radial (lateral) border of first metacarpal (thumb)
what opposes the thumb
Opponens Pollicis CMC Opposition
Abductor Digiti Minimi Manus attachments
Pisiform & tendon of the flexor carpi ulnaris ->
proximal phalanx of little finger (medial/ulnar side)
what does the Abductor Digiti Minimi Manus do
Abducts the little finger (5th metacarpal) @ MCP joint
Flexor Digiti Minimi Manus do
Flexes little finger (5th metacarpal) @ MCP joint
Flexor Digiti Minimi Manus attachments
Flexor Retinaculum & hook of hamate ->
proximal phalanx of little finger (ulnar/ medial side)
Opponens Digiti Minimi attachments
Flexor Retinaculum & hamate ->
entire length of palmar surface of 5th metacarpal (small finger)
What does the Opponens Digiti Minimi do
Opposes Little Finger (5th metacarpal) @ CMC joint
Which muscle of the Thenar and Hypothenar group of muscles does not attach to the flexor retinaculum
Abductor digiti Minimi Manus
Adductor Pollicis attachments
oblique head: base of 2nd the 3rd metacarpal & capitate
transverse head: anterior surface 3rd metacarpal ——>
medial side of the proximal phalanx of the thumb
(2 heads coverage & inserted by a tendon containing a sesmoid bone)
what does the Adductor Pollicis do
Thumb Adduction @ CMC and MCP joint
Radial Artery passes through two heads of what muscle
Adductor Pollicis
what are the lumbrical manus attachments
distal tendons of flexor digitorum profundus ->
distal tendons of extensor Digitorum
“rooftop” muscle
lumbrical manus
Only muscle with no bony attachment
lumbrical manus
what does the Lumbrical Manus do
EXTEND FINGERS 2-5 @ PIP AND DIP
FLEXES FINGERS 2-5 @ MCP JOINT
palmar interossei attachment
palmar surface metacarpal 2,4,5 -> base proximal phalanges 2, 4,5 on “middle finger” side
palmar interossei does what
Adducts fingers 2,4,5 @ MCP joint PAD: palmar adduction
dorsal interossei attachments
metacarpals 1-5 -> base proximal phalanx 2,3 &4 side that faces away from the center of middle finger
dorsal interossei does what
DAB:Dorsal Abducts
Abducts fingers 2-4 @ MCP joint
Unipennate
palmar interossei
Bipennate
dorsal interossei / fibers running in each direction
palmar interossei
index finger is at what aspect:
Ring finger is at what aspect:
Small finger is at what aspect:
index: ulnar aspect
ring finger: radial aspect
Small finger: radial aspect
