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what are intrinsic muscles of the hand?
many small muscles within the hand allow for manual dexterity (precise movements)
what 3 groups are the hands of muscles separated into>?
what does thenar mean?
what does hypothenar mean?
what does midpalmer mean?
middle of the hand
what 2 nerves innervate the hand?
median and ulnar nerves
What do the thenar muscles form?
the thenar eminence of the lateral side of the palm
*rounded muscular area
what 3 muscles form thenar eminence?
-abductor pollicis brevis
-flexor pollicis brevis
which muscle moves the thumb but not part of thenar eminence?
thenar eminence) abductor pollicis brevis- origin (3)
thenar eminence) abductor pollicis brevis- inserts
base of proximal phalanx of thumb
thenar eminence) abductor pollicis brevis- innervated
thenar eminence) abductor pollicis brevis- action
abduction of the thumb
thenar eminence) abductor pollicis brevis- what side does it form?
forms the lateral edge of the thenar eminence
thenar eminence) flexor pollicis brevis- origin (2)
thenar eminence) flexor pollicis brevis- inserts
base of the proximal phalanx of thumb
thenar eminence) flexor pollicis brevis- action (2)
-flexes the thumb
-aids in opposiition
thenar eminence) flexor pollicis brevis- innervated
thenar eminence) opponens pollicis- origin (2)
thenar eminence) opponens pollicis- inserts
lateral side of shaft of the 1st metacarpal
thenar eminence) opponens pollicis- action (2)
-helps to oppose the thumb
*moves the thumb across the palm to meet little finger
thenar eminence) opponens pollicis- innervated?
thenar eminence) opponens pollicis- what 2 msucles is the oponens pollciis deep to?
-abductor pollicis brevis and
-flexor pollicis brevis
adductor pollicis- origin for oblique head (2)
-and bases of metacarpals 2 and 3
adductor pollicis- origin for transverse head
horizontally placed from 3rd metacarpal
adductor pollicis- inserts
ulnar (medial) side of the proximal phalanx of thumb
adductor pollicis- action (2)
-helps oppose the thumb
adductor pollicis- inneravted?
what muscle fills int he web space on the palmer side of the hand?
what do the hypothenar muscles form?
for the hypothenar eminence on the medial side of the palm
what are the 3 muscles of hypothenar?
-abductor digit minimi
-flexor digiti minimi brevis
-opponens digiti minimi
why is palamris brevis not included in hypothenar compartment?
it does not move the little finger
hypothenar) palmaris brevis- origin
hypothenar) palmaris brevis- inserts
skin of the medial side of hand
hypothenar) palamris brevis- innervated
hypothenar) palmaris longus- action
helps to deepen palm and griping action
hypothenar) abductor digiti minimi- origin
hypothenar) abductor digiti minimi- inserts
medial side of the base of the proximal phalnax of 5th digit
hypothenar) abductor digiti minimi- innervated
hypothenar) abductor digiti minimi- action?
abducts the little finger
which is the most medial muscle in the hypothenar eminence?
abductor digiti minimi
hypothenar) flexor digiti minimi brevis- origin (2)
-hook of the hamate bone
hypothenar) flexor digiti minimi brevis- inserts
medial side of teh base of the proximal phalanx of 5ht metacarpal
*same as abductor minimi
hypothenar) flexor digiti minimi brevis- innervated?
hypothenar) flexor digiti minimi brevis- action?
flexes the little finger
hypothenar) opponens digiti minimi- innervated by
hypothenar) opponens digiti minimi- origin (2)
-hook of the hamate bone
hypothenar) opponens digiti minimi- inserts
ulnar side of the 5th metacarpal
hypothenar) opponens digiti minimi- action?
helps to oppose the little finger
*bring the littel finger to meet the thumb
hypothenar) opponens digiti minimi- which 2 muscles lie superficial to this msucle?
-flexor digit minimi brevis
-abductor digiti minimi
what are the 2 types of midpalmer msucles?
lumbricles and interossei
midpalmer) which 2 actions do they do?
-flex the mpj
-extend the ipj
***bye bye msucles
midpalmer) what 2 actions does the interossei do?
abduct and adduct the fingers
midpalmer) lumbricles- origins
lateral side of each tendon of the flexor digitorium profundus in palm
midpalmer) lumbricles- inserts
lateral edge of extensor expansion hood on proximal phalanx of fingers 2-5
midpalmer) lumbricles- action (2)
-flex fingers at metacarpophalangeal joints
-extend fingers at interphalangeal joints
midpalmer) lumbricles- fingers 1 and 2 are innervated by?
midpalmer) lumbricles- fingers 3 and 4 are innervated by?
midpalmer) palmar interossei-origin
the side of each metacarpal that faces the midaxis of rthe hand
*absent in metacarpal III
midpalmer) palmar interossei- inserts
extensor expansion on the first phalanx of each finger on side facing midaxis of hand
midpalmer) palmar interossei- action (2)
- acts with lumbricals to create bye-bye muscles
midpalmer) dorsal interrossei-origin
bipennate origin (2 different bones) on the adjacent sides of bones that surround it
ex) 1st dorsal interrosei originates from 1st and 2nd metacarpal
midpalmer) dorsal interossei- inserts
extensor expansion over proximal phalanx of fingers 2-4 on side opposite midaxis of hand but on both sides of finger 3
midpalmer) dorsal interossei- innervated
midpalmer) dorsal interossei- action
-abducts the fingers
-can help create the bye bye movement
*helps to flex the metacarpalphalanegal joint and interphallangeal joint
midpalmer) palmar interrosei -innervated
what type of joint is located on the metacarpophalangeal joints? what are their movements?
condyloid and saddle joint; circumduction
what type of joint is located on IPJ? and whats their movement?
hinge joint; flexion and extension
how do carpal tunnel syndrome occur?
reduction in the size of the carpal tunnel
carpal tunnel syndrome) which digits are affected by this? what do they feel?
lateral 3.5 digits; sensory loss or tingling
carpal tunnel syndrome) what are these idnividual unable to do?
oppose the thumb bc they lose motor control to the thenar muscles (except adductor)
carpal tunnel syndrome) how is it relieved?
partial or complete division of the flexor retinaculum
muscles of hand