HAND Flashcards
The longitudinal fibres of the palmar fascia extend to the fingers and blend and mix with the fibrous tissue of the fingers. what is the role of this fibrous tissue
support the flexor tendons int he fingers - holds them in place and protects them from trauma
What is the firbosseous tunnel of the fingers made of
both fibrous and bone tissue. Roof is fibrous tissue and floor is bone tissue
Flexor pollicis brevis
O - lateral carpal bones + flexor retinaculum
I - base of middle phalanx of thumb
A - Flexion
NS - Sup: Recurrent median Inf: deep ulnar
Abductor pollicis brevis
O - lateral carpal bones
I - Proximal phalanx and 1st MC bone
A - Abduction of thumb
NS - Recurrent median
Adductor pollicis
O - Distal carpal bones and MC 2 and 3
I - Base of proximal phalanx of thumb
A - Adduction of thumb
NS - Deep ulnar
Opponens pollicis
O - Lateral carpal bones
I - Lateral surface of 1st MC
A - Opposition
NS - Median recurrent
Opposition is considered a combination of what two movements
flexion and adduction
Abductor digiti minimi
O - Medial carpal bones and flexor carpi ulnaris tendon
I - Proximal phalanx of thumb and 5th MC bone
A - Abduction of digiti minimi
NS - Deep ulnar nerve
Palmaris brevis
O - Palmar fascia, tendon of palamaris longus, flexor retinaculum
I - Deep surface of skin on medial side of hand
A - enabled our ancesters to make cup with hands to use tools
NS - Superficial ulnar nerve
Opponens digiti minimi
O- Flexor retinaculun, medial carpal bones
I - Medial side of 5th MC bone
A - Opposition of 5th finger
NS - Deep ulnar
Flexor digiti minimi
O - Medial carpal bones, flexor retinaculum
I - Proximal end of proximal phalanc
A - Flexion of the 5th digit
NS - deep ulnar N.
Palmar interosseous
O - MC bones 2,4,5
I - DDE
A - Adduction of fingers
NS - Deep ulnar
Dorsal interosseous
O - All MC bones
I - DDE
A - Abduction
NS - Deep ulnar
Lumbricals
O - Arise from tendon of flexor digitorum profundus
I - Dorsal digital expansion of corresponding finger
A - Flexion of MC phalangeal, extension of IP joint - byebye
NS - Lateral two: median nerve. medial two: deep ulnar nerve
How many intrinsic muscles of the hand are there
19
What tendons are found in the carpal tunnel
Flexor digitorum superficialis
Flexor digitorum profundus
Flexor pollicis longus
The synovial sheaths of the 1st and 5th finger and continuous with those for the flexors passing through the carpal tunnel, what is the consequence of this
Penetrating wound in the thumb and 5th finger, if they become inflammed or infected it will travel to the carpal tunnel tendons causing carpal tunnel syndrome
What is carpal tunnel syndrome
compression of median nerve
What are the causes of carpal tunnel syndrome
- Overuse of CT tendons
- Penetrating injury to thumb or pinky
- normal consequence of pregnancy
Why does carpal tunnel occur with pregnancy
- Because entire volume of interstitial fluid in the body increases
What are the signs and symptoms of carpal tunnel syndrome
- Sensory deficiency - lateral 3.5 fingers will have number
- Motor deficiencies - fully impaired opposition. Partially impaired: flexion of thumb, abduction of thumb
What forms the superficial palmar arhc
superficial branch of ulnar artery and superficial palmar branch of radial artery
Where does the deep palmar arch sit
deep to all tendons and just superficial to interosseous muscles
what supplies blood to fingers?
Palmar metacarpal artery
Common palmar digital artery
