Wrist
What is the purpose of carpols
Force transfer from hand to wrist
What does the distal radioulnar joint do
supination/pronation
Distal radioulnar joint actions and features
Pronation/supination
Forces transmission from hand to radius/ulna
Not very stable because bones don't overlap.
Supported by the joint capsule and fibrocartilage complex
Wrist flexors lateral to medial
Flexor carpi radialis
palmaris longus
Flexor carpi ulnaris
Posterior hand muscles, which fingers they act on and what they do
Finger extension (rays 2-5): Extensor digitorum, Extensor digiti minimi. Assisted by the interossei and lumbricals
Abduction (rays 2-4): Dorsal interossei
Abduction (ray 5):Abductor digiti minimi
What are the carpals of the hand?
So - Scaphoid
Long - Lunate
To the - Triquetrum
Pinky - Pisiform
Here - Hamate
Comes - Capitate
The - Trapezoid
Thumb - Trapezium
What is the Midcarpal
Gliding joint between proximal and distal carpals (sits between 2 rows of joints.)
What does extrensic mean?
Originates outside of the hand
Digit flexors that assist in wrist flexion
Flexor digitorum superficialis
Flexor digitorum profundus
Flexor pullicus longus
Anterior hand muscles, the fingers they act on and their actions
Finger flexion (rays 2-5): Flexor digitorum profundus, Flexor digitor superficialis
Flexion at the metacarpophalangeal articulation: Lumbricals, interossei
Radio Carpal joint bones and functions
Bones: Distal end of the radius and the scaphoid and lunate carpals
Functions: Flexion/Extension, Radial/Ulnar flexion, deviation(waving)
Intercarpal joints
Two joints side by side
Synovial plane (gliding) joint
Interphalangeal joints
Hinge joints
Interphalangeal of thumb, proximal interphalangeal, distal phalangeal
Wrist extensors lateral to medial
Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor carpi ulnaris
Extrinsic Thumb Muscles
Flexor Pollicis longus
Extensor pollicis longus
Extensor pollicis brevis
Abductor pollicis longus
What are the wrist flexors
Flexor carpi Radialis
Flexor Carpi Ulnaris
Palmaris longus
How does a Colles fracture happen and what bone is effected
Occurs from catching yourself when you fall
The distal radius is fractured (looks like a fork)
Digit extensors that assist with wrist extension
Extensor digitorum
Extensor indicis
extensor digiti minimi
Intrinsic thumb muscles
Flexor pollicis brevis
Abductor pollicis brevis
Opponens pollicis
Adductor pollicis
What are the wrist extensors
Extensor carpi ulnaris
Extensor carpi radialis longus
Extensor carpi radialis brevis
What is a boxers fracture, how does it occur
5th metacarpal spiral fracture from punching (compressive forces)
Full flexion of the MP, PIP, & DIP joints long finger flexors must override what muscles to fully flex the fingers?
lumbricals & interossei