| Interphalangeal joints | |
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| Human hand bones | |
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| Metacarpophalangeal articulation and articulations of digit. Volar aspect. | |
| Latin | articulationes interphalangeae manus, articulationes digitorum manus |
| Gray's | subject #91 333 |
The interphalangeal articulations of hand are hinge-joints of the phalanges of the hand. There are two sets (except in the thumb):
- "proximal interphalangeal joints" (PIP), those between the first (also called proximal) and second (intermediate) phalanges
- "distal interphalangeal joints" (DIP), those between the second and third (distal) phalanges
A similar group of articulations also function in the toes.
Contents |
Ligaments
Each joint has a volar ligament and two collateral ligaments. The arrangement of these ligaments is similar to those in the metacarpophalangeal joints (also known as MCP joints).
The extensor tendons supply the place of posterior ligaments.
Movements
The only movements permitted in the interphalangeal joints are flexion and extension.
- Flexion is more extensive, about 100°, in the PIP joints and slightly more restricted, about 80°, in the DIP joints.
- Extension is limited by the volar and collateral ligaments. These joints break the most often out of every joint in the body.
The muscles generating these movements are:
| Location | Flexion | Extension |
| fingers | the flexor digitorum profundus acting on the proximal and distal joints, and the flexor digitorum superficialis acting on the proximal joints | mainly by the lumbricals and interossei, the long extensors having little or no action upon these joints |
| thumb | the flexor pollicis longus | the extensor pollicis longus |
See also
External links
- Hand kinesiology at UK bone/phaljt.html
- proximal+interphalangeal+joints at eMedicine Dictionary
- distal+interphalangeal+joints at eMedicine Dictionary
- Diagram at depuy.com
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated.
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