The wrist (carpus), composed of the carpal bones, articulates at the wrist joint (or radiocarpal joint) proximally and the carpometacarpal joint distally. The wrist can be divided into two components separated by the midcarpal joints. The small movements of the eight carpal bones during composite movements at the wrist are complex to describe, but flexion mainly occurs in the midcarpal joint whilst extension mainly occurs in the radiocarpal joint; the latter joint also providing most of adduction and abduction at the wrist.
How muscles act on the wrist is complex to describe. The five muscles acting on the wrist directly — flexor carpi radialis, flexor carpi ulnaris, extensor carpi radialis, extensor carpi ulnaris, and palmaris longus — are accompanied by the tendons of the extrinsic hand muscles (i.e. the muscles acting on the fingers). Thus, every movement at the wrist is the work of a group of muscles; because the four primary wrist muscles (FCR, FCU, ECR, and ECU) are attached to the four corners of the wrist, they also produce a secondary movement (i.e. ulnar or radial deviation). To produce pure flexion or extension at the wrist, these muscle therefore must act in pairs to cancel out each others secondary action. On the other hand, finger movements without the corresponding wrist movements require the wrist muscles to cancel out the contribution from the extrinsic hand muscles at the wrist.
Other articles related to "wrist":
... Wrist is situated 2 kilometres south east of Kellinghusen on the main railway line from Hamburg to Kiel ... The Bundesstraße 206 passes Wrist ... Warringholz Westermoor Wewelsfleth Wiedenborstel Willenscharen Wilster Winseldorf Wittenbergen Wrist Wulfsmoor ...
... positions) a minimum of tension in fingers, wrist, or forearm a healthy position (without strain) The hand's position is influenced by the arm changing where the right arm ... This can informally lead to wrist injuries) bending of hand to the left or right from the wrist (this is usually considered a strain, and today many guitarist hold the hand almost straight compared to the arm ...
... Palmar flexion is one of the movements of the wrist and hand which takes place at the wrist joint, where the angle between the palm and the forearm is decreased ... In this context, this consists of bending the hand towards the inside of the wrist, an action known as flexion in anatomical terms ... of hand and the forearm is reduced - specifically, the hand bends away from the inside of the wrist ...
... of the shuttlecock and of badminton rackets allow badminton players to make use of the wrist and fingers much more than tennis players in tennis the wrist is normally held stable, and playing with a mobile ... power in badminton strokes comes mainly from the wrist ... First, it is strictly speaking a category error the wrist is a joint, not a muscle the forearm muscles control its movement ...
... The wrist is perhaps the most complicated joint in the body ... Optimal wrist function requires stability of the carpal components in all joint positions under static and dynamic conditions ...
Famous quotes containing the word wrist:
“you show her the two hands
that grip each other fiercely,
one being mine, one being yours.
Torn right off at the wrist bone
when you started in your
impossible going, gone.”
—Anne Sexton (19281974)