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 the 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.

2023年11月3日 · Dorsal interossei are bipennate (feather-like) muscles found in the dorsal compartment of the hand. The prefix bi- means that they arise by two heads which converge to attach onto a central tendon, which gives them a shape of a feather.

2024年9月27日 · The interossei muscles are located between the metacarpal bones of the hand. They can be divided into two groups – dorsal and palmar. In addition to their actions of abduction (dorsal interossei) and adduction (palmar interossei) of the fingers, the interossei also assist the lumbricals in flexion at the MCP joints and extension at the IP joints.

These muscles insert into the dorsal side of the hand – into the metacarpal bones or in the extensor expansion. Their actions include extending the wrist and the fingers at their metacarpophalangeal and interphalangeal joints.

In the hand, there are four dorsal Interossei which lie superficially, in between the metacarpals on the dorsum of the hand. Each muscle is bipennate in shape and extends from the proximal ends of adjacent metacarpals to the proximal phalanx and …

2023年11月13日 · Dorsal venous network of hand: predominant drainage route of the hand (also receiving palmar venous return via perforating veins). Gives rise to cephalic and basilic veins. Palmar venous arches: Receives palmar metacarpal …

2023年7月17日 · These small muscles, despite their limited range of motion and together with the interosseous palmar muscles, play key roles in the function of the hand: grip and pinch. Of all the intrinsic muscles of the hand, the dorsal interossei are the most dorsally located.

2024年3月30日 · The dorsal interossei (DI) are a group of 4 intrinsic hand muscles located between the 2nd to 5th metacarpals. These small muscles are involved in the movements of the fingers. The muscles are referred to as the 1st to 4th dorsal interosseous from the …

2021年8月24日 · The dorsal intrinsic muscles of the hand are bipennate and are the most dorsally situated of all intrinsic muscles of the hand. They are associated with abduction of the 2 nd, 3 rd, and 4 th fingers, and their tendons run dorsally to the deep transverse metacarpal ligament.

The Interossei dorsales (Dorsal interossei) are four in number, and occupy the intervals between the metacarpal bones. They are bipenniform muscles, each 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.