Flashcards in Hand and wrist Deck (43):
the thumb is redponsible for how much of the hand's function
the index/middle is responsible for how much of the hand's function
the ring/pinky is responsible for how much of the hand's function?
which carpal bone is boat shaped?
which carpal bone is moon shaped?
which carpal bone is pyramidal?
which carpal bone is a sesamoid bone?
which carpal bone is last to ossify? (at 12 y.o)
which is the largest carpal bone, which is also the 1st to ossify? (1-2 y.o)
which carpal bone has a hook?
which carpal bones belong to the proximal row? distal row?
proximal: some lovers try positions
scaphoid, lunate, triquetrium, pisiform,
distal: they can't handle
trapezium, trapezoid, capitate, hamate
which finger does not have a middle phalanx?
the radiocarpal joint is made up of
the radius, scaphoid and lunate
the mid carpal joint is formed by
the distal and proximal carpal bones
how many extrinsic muscles of the hand is present?
19/20 (+palmaris brevis:40% of the time
[innervation and action] extensor carpi radialis longus
radial nerve; extends and abducts the hand
[innervation and action] extensor carpi radialis brevis
deep branch of radial nerve; extension and abduction of the hand
[innervation and action] extensor carpi ulnaris
deep branch of the radial nerve; extension of the hand
[innervation and action] extensor digitorum
deep branch of radial nerve; extensor of medial 4 digits
[innervation and action] extensor digitorum minimi
posterior interosseus nerve; extends the proximal phalanx of the 5th digit
what structures pass through the carpal tunnel?
flexor digitorum superficialis (4 tendons) flexor digitorum profundus (4 tendons) flexor pollicis longus (1tendon) median nerve
what holds the carpal tunnel in place?
[innervation and action] flexor carpi radialis
median nerve; flexes and abducts hand at wrist
[innervation and action] palmaris longus
median nerve; flexes hand and tenses palmar aponeurosis
[innervation and action] flexor carpi ulnaris
ulnar; flexes and adducts hand
[innervation and action] flexor digitorum superficialis
median nerve; flexes middle 4 digits
[innervation and action] flexor digitorum profundus
ulnar, median; flexes phalanges 4,5 (ulnar), 2,3 (median)
[innervation] 1st and 2nd lumbricals
[innervation] 3rd and 4th lumbricals and interossei
[innervation] abductor pollicis brevis, opponens pollicis brevis
flexor pollicis brevis superficial head
[innervation] flexor pollicis brevis deep head; adductor pollicis
tap the median neve along its course in the wrist
positive: tingling sensation
position dorsal side of hands against each other
positive: parasthesia, hyposthesia, pain
Which annular ligaments prevent bowstringing of tendon?
boundaries of the anatomical snuff box
medial:extensor pollicis longus
lateral:abductor pollicis longus and extensor pollicis brevis
which nerve can be found in the anatomical snuff box?
De Quervaine's tendosynovitis Syndrome
inflammation of the tendons of the extensor pollicis brevis
fist made with the thumb and wrist ulnary deviated, stretching the tendons over the radial styloid causing significant pain
inflammation of the origin of the extensor muscles of the forearm
small tear or inflammation in the origin of the flexor muscles of the forearm
cubital tunnel syndrome
compression of the ulnar nerve at the cubital tunnel