Abstract
At the beginning of the late cap phase of the normal differentiation of human spermatids, a unique structure, the "spindle shaped body", occupies part of the future middle-piece. This spindle-shaped body was followed throughout its development, and its functional relationahip to the formation of the fibrous sheath is discussed. The spindle-shaped body disappears when the fibrous sheath is completed and the annulus moves down, giving rise to the middle-piece.
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