6 Wrist & Hand Flashcards
empty card ?
why can the hand be adducted to a greate degree than it can be abducted ?
radial styloid process extends further distally than does the ulnar styloid process
how many extensor compartments cross the wrist contain specific posterior forearm tendons ?
6
What’s the purpose of the common synovial sheaths for the tendons of the posterior forearm ?
stops the tendons from bowstringing during movement at the wrist
Actions that the wrist is capable of ?
- Flexion
- Extension
- Adduction (ulnar deviation)
- Abduction (radial deviation)
Wrist flexor muscles ?
- flexor carpi radialis
- flexor carpi ulnaris
- assisted by the flexors of the digits
wrist extensor muscles ?
- Extensor carpi radialis longus
- Extensor carpi brevis
- Extensor carpi ulnaris
2 most commonest types of fractures of wrist ?
- colles’ - posterior displacement of distal radial fragment - fork deformity
- smith’s - anterior displacement of distal radial fragment
The carpal bones from an arch that helps form what tunnel ?
carpal / fibro-osseous tunnel
what’s flexor retinaculum ?
a thick connective tissue ligament that bridges the space between the medial and lateral sides of the base of the arch and forms the roof of the carpal tunnel
What passe through the carpal tunnel ?
9 tendons and one nerve
* 4 tendons of the flexor digitorum profundus
* 4 tendons of the flexor digitorum superficialis
* Tendon of the flexor pollicis longus
* Median nerve.
Which nerve and artery runs above the carpal tunnel into the hand ?
ulnar nerve & ulnar artery
hand…
boundaries of the snuffbox ?
- medially = extensor pollicis longus
- laterally = extensor pollicis brevis & (most lateral) abductor pollicis longus
If snuffbox is palpated what can be felt ?
- radial artery (palpable pulse)
- radial styloid process
- scaphoid
- trapezium
- base of 1st metacarpal
