The Hand Flashcards
what is the anatomical snuff box also called
radial fossa
what makes up the ulnar border of the anatomical snuff box
tendon of the extensor pollicis longus
what makes up the radial border of the anatomical snuff box
tendons of the abductor pollicis longus and extensor pollicis brevis
what makes up the proximal border of the anatomical snuff box
styloid process of the radius
what makes up the floor of the anatomical snuff box
carpal bones
what makes up the roof of the anatomical snuff box
skin
what is the contents of the anatomical snuff box
radial artery, radial nerve branch, cephalic vein
fracturing what causes pain in the anatomical snuff box
scaphoid
what are the 8 carpal bones
scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, capitate, hamate
what is the blood supply to the hand
- the ulnar and radial nerve link together to form the deep and superficial palmar arches
- common digital arteries
how many flexor tendons are attached too each digit
2 to the fingers and 1 to the thumb
what are the 2 flexor tendons attached to the fingers
flexor digitorum profundus and flexor digitorum superficialis
what is the flexor tendon attached to the thumb
flexor carpi radialis tendon
why must the flexor tendons be attached to the bone via sheaths
otherwise there would be a bowstring affect which reduces the range of movement of the fingers
what are lubricals
muscles that originate from the flexor digitorum profundus and wrap distally and laterally around the finger to insert to the extensor hood
what do the lumbricals cause
flexion at the MCP joint and extension at the IP joints
which nerves innervates the lumbricals
- ulnar innervates the medial 2 but the median innervates the lateral 2
what are the interossei
muscles located between the metacarpals and are either dorsal or palmar
what do the interossei do
abduction and adduction of fingers
assist lumbricals
what are the movements of the hand
cylindrical grasp, hook, palmar, spherical grasp, lateral
