Interphalangeal joints
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| Interphalangeal joints | |
|---|---|
| Metacarpophalangeal articulation and articulations of digit. Volar aspect. | |
| Latin | articulationes digitorum manus |
| Gray's | subject #91 333 |
The interphalangeal joints are hinge-joints in the digits (fingers and toes); each has a volar ligament and two collateral ligaments. The arrangement of these ligaments is similar to those in the metacarpophalangeal joints. The extensor tendons supply the place of posterior ligaments.
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[edit] Movements
The only movements permitted in the interphalangeal joints are flexion and extension; these movements are more extensive between the first and second phalanges than between the second and third. The amount of flexion is very considerable, but extension is limited by the volar and collateral ligaments.
[edit] Muscles acting on the joints of the digits
Flexion of the metacarpophalangeal joints of the fingers is effected by the flexores digitorum sublimis and profundus, lumbricales, and interossei, assisted in the case of the little finger by the flexor digiti quinti brevis. Extension is produced by the extensor digitorum communis, extensor indicis proprius, and extensor digiti quinti proprius.
Flexion of the interphalangeal joints of the fingers is accomplished by the flexor digitorum profundus acting on the proximal and distal joints and by the flexor digitorum sublimis acting on the proximal joints. Extension is effected mainly by the lumbricales and interossei, the long extensors having little or no action upon these joints.
Flexion of the metacarpophalangeal joint of the thumb is effected by the flexores pollicis longus and brevis; extension by the extensores pollicis longus and brevis. Flexion of the interphalangeal joint is accomplished by the flexor pollicis longus, and extension by the extensor pollicis longus.
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[edit] See also
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 As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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| Major Joints |
| Vertebral column: atlanto-axial - atlanto-occipital - temporomandibular - sternocostal - sacroiliac
Upper extremity: sternoclavicular - acromioclavicular - shoulder - elbow/proximal radioulnar articulation - wrist/distal radioulnar articulation - carpometacarpal - metacarpophalangeal - interphalangeal Lower extremity: hip - knee - ankle - subtalar - metatarsophalangeal |
