Abstract
The substructures of human spermatozoa as observed in the electron microscope follow a plan closely similar to the one established for ram spermatozoa, including the existence of a galea capitis in the head. Lateral subdivisions of the head show rather greater complexity. Details of surface structures and vacuoles are discussed; marked variations in size, shape and electron-scattering power of the head complicate the establishment of morphological criteria for normality. A qualitative and quantitative account is given of the transverse complexes of the middle-piece, tail and tail-end; brush-effects and their general occurrence, and general effects of temperature shock (from 20 to 0° C) are described.
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