Bones of forearm, wrist and hand Flashcards
What is the interosseous membrane?
An incomplete fibrous structure, conforming stability to the forearm structure in addition to the proximal and distal radio-ulnar joints.
What does the interosseous membrane help with?
Lax enough to allow supination and pronation at the radio-ulnar joints.
What sits between the ulna and the carpal bones?
Articular disc
The radius articulates with what?
The scaphoid and lunate (carpal bones)
What type of fluid is found between the forearm and carpal bones?
Synovial
What is support to the wrist joint provided by?
A number of ligaments, these of which you don’t need to know in detail.
Flexion of the wrist joint is caused by?
Contraction of the muscles in the flexor compartment
What is the extension of the wrist joint caused by?
Contraction of the muscles in the Extensor tendon compartment
What is the combined action of flexor and extensor carpi ulnaris cause?
Ulnar deviation or adduction of the wrist
Which muscles are responsible for radial deviation or abduction of the wrist?
Flexor and extensor carpi radialis
Circumduction of the joint is the rotation of what?
The wrist using a combination of all the movements listed above
What are the metacarpals?
The bones sitting between the carpal bones and the phalanges.
There are 5 in total and articulate proximally at the carpo-meto-carpal (CMC) joints, and distally at the metacarpophalangeal (MP) joints
What are the phalanges?
The distal bones in the hand
What are proxmal and distal phalanc of the thumb?
Thumb
