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Palmar interossei are short unipennate intrinsic muscles of the hand. They lie on the palmar surface of the hand and along with the dorsal interossei muscles occupy the spaces between the metacarpal bones.
The palmar interossei or volar are three short, unipennate muscles on the palmar surface of the hand and along with the dorsal interossei muscles. These occupy the spaces between the metacarpal bones.These are attached to the index, ring, and little fingers. They are smaller than the dorsal interossei 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.
The dorsal interossei muscles are situated within the dorsal compartment of the hand. They lie deep to the palmar interossei, filling the interosseous space. All four dorsal interossei arise by two heads from each metacarpal bone.
Introduction. The interossei muscles are intrinsic muscles of the hand located between the metacarpals. They consist of four (or three) palmar and four dorsal muscles that, respectively. These muscles are responsible for finger adduction and abduction.
The palmar interossei, together with the dorsal interossei and the lumbricals, are active components of the finger's extensor mechanism. Fibers from some of the interossei contribute directly to the extensor hoods that wrap around the proximal phalanges, while other fibers may contribute to the central tendon and lateral bands of the mechanism.
The palmar interossei are a group of paired intrinsic muscles of the hand located between the metacarpals. They consist of four, and sometimes three, palmar muscles that, adduct fingers. The palmar interossei also assist in flexion of the metacarpophalangeal joints and extension of the interphalangeal joints.
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.
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 dorsal digital expansion of the appropriate finger.
It is true that the 3 palmar interossei adduct and the 4 dorsal ones abduct the fingers from the midline of the hand; however, an understanding of the anatomy demonstrates how the insertions and actions of both sets of muscles synergize to provide the foundation for hand posture and hand function.