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Interphalangeal joint of the thumb

Interphalangeal IP joints of the hand are hinge-type synovial joints between adjacent phalanges. Each joint is enclosed by a fibrous capsule which attaches to the margins of the articular surfaces and is lined by a synovial membrane. Deep digital arteries from the superficial palmar arch. Digital nerves from the ulnar and median nerves. Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys.
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Interphalangeal joints of the foot

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Anatomy and Biomechanics of the Finger Proximal Interphalangeal Joint

A complete understanding of the normal anatomy and biomechanics of the proximal interphalangeal joint is critical when treating pathology of the joint as well as in the design of new reconstructive treatments. The osseous anatomy dictates the principles of motion at the proximal interphalangeal joint. Subsequently, the joint is stabilized throughout its motion by the surrounding proximal collateral ligament, accessory collateral ligament, and volar plate. The goal of this article is to review the normal anatomy and biomechanics of the proximal interphalangeal joint and its associated structures, most importantly the proper collateral ligament, accessory collateral ligament, and volar plate.
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Joints of the Thumb – Language of Hand and Arm Surgery Series

Hard lump on finger joint under skin? What could be the possible cause? Keep reading to find out here. Various other terms used for different kinds of finger lumps would be the ff: nodule, bump, tumor, contusion, and cyst. A finger lump may be brought on by a variety of conditions, such as infection, tumor, inflammation, or trauma.
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In human anatomy, the dorsal interossei DI are four muscles in the back of the hand that act to abduct spread the index , middle , and ring fingers away from hand's midline ray of middle finger and assist in flexion at the metacarpophalangeal joints and extension at the interphalangeal joints of the index, middle and ring fingers. There are four dorsal interossei in each hand. They are specified as 'dorsal' to contrast them with the palmar interossei , which are located on the anterior side of the metacarpals. The dorsal interosseous muscles are bipennate , with each muscle arising by two heads from the adjacent sides of the metacarpal bones, but more extensively from the metacarpal bone of the finger into which the muscle is inserted. They are inserted into the bases of the proximal phalanges and into the extensor expansion of the corresponding extensor digitorum tendon.
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