Wrist
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| wrist joint | |
|---|---|
| Image:Human wrist.png | |
| A human wrist. | |
| Latin | articulatio radiocarpalis |
| Gray's | subject #86 327 |
| MeSH | Wrist+joint |
| Dorlands/Elsevier | a_64/12161475 |
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In human anatomy, the wrist is the flexible and narrower connection between the forearm and the palm. The wrist is essentially a double row of small short bones, called carpals, intertwined to form a malleable hinge.
The wrist-joint (articulatio radiocarpea) is a condyloid articulation allowing three degrees of freedom.
Structure of joint
The parts forming it are the lower end of the radius and under surface of the articular disk above; and the scaphoid, lunate, and triquetral bones below.
The articular surface of the radius and the under surface of the articular disk form together a transversely elliptical concave surface, the receiving cavity.
The superior articular surfaces of the scaphoid, lunate, and triquetrum form a smooth convex surface, the condyle, which is received into the concavity.
The bones of the wrist can be easily remembered by the mnemonic SLTPTTCH - Some Lovers Try Positions That They Can't Handle. These represent the bones in order of proximal row radial to ulnar and then distal row radial to ulnar: Scaphoid, Lunate, Triquetral, Pisiform; Trapezium, Trapezoid, Capitate, Hamate.
Ligaments
The joint is surrounded by a capsule, strengthened by the following ligaments:
- Palmar radiocarpal ligament
- Dorsal radiocarpal ligament
- Ulnar collateral ligament (wrist)
- Radial collateral ligament (wrist)
The synovial membrane lines the deep surfaces of the ligaments above described, extending from the margin of the lower end of the radius and articular disk above to the margins of the articular surfaces of the carpal bones below. It is loose and lax, and presents numerous folds, especially behind.
Movements
The movements permitted in this joint are flexion, extension, abduction, adduction, and circumduction. They are studied with those of the carpus, with which they are combined.
See also
- Distal radius fracture
- Brunelli Procedure, related to instability in the wrist
Additional images
 Right Human Posterior Distal Radius, Ulna, Carpals |
 Right Human Anterior Distal Radius, Ulna, Carpals |
 Carpus |
 Ligaments of wrist. Anterior view |
 Ligaments of wrist. Posterior view. |
References
External links
- Wrist ligaments at upenn.edu
- wrist at eMedicine Dictionary
- wrist+joint at eMedicine Dictionary
- Hand kinesiology at UK bone/wrist.html
Human anatomical features | ||
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| Skin | Hair | |
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Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
