STRUCTURAL ANALYSIS OF THE FOURTH DORSAL INTEROSSEUS OF THE HUMAN HAND

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Abstract
The structure of the 4th dorsal interosseus muscle was analyzed. Transverse and horizontal series were used. The muscle consists of main radial and ulnar bellies at proximal levels, the former pushing between the neighboring volar-interossei. These bellies are joined by a deep radial belly in which a transverse part and a radio volar part can be distinguished. Tendon formation proceeds in a typical way leading to a dorsal and a volar complex. The partition in the muscle is marked by the formation of an intramuscular septum which is continuous with the lamina-transversa. The fate of the 2 areas is extensively described; and the relation that various tendon fascicles establish with the volar capsule, the transverse intermetacarpal ligament, the extensor-expansion and the base of the phalanx is emphasized. The muscle presents a 2-fold insertion; 1 deep tendon the dorsal tendon of proximal levels inserts into the base of the phalanx, the other (superficial to the former and derived from the radio-volar area with contribution of ulnar fibers) into the extensor expansion. This systemic description does not account for structural relationships the muscle establishes in the metacarpophalangeal region which Influence the functional importance of this muscle.

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