Figure 18.

An electron micrograph of a section from the testis of a rat of group III showing a spermatid cell with shrunken nucleus (N1) and another cell with normal nucleus (N2). The nuclei of both cells are covered by acrosomal cap (crossed arrow) and the cytoplasm shows golgi saccules (G) and mitochondria (arrow head). The mature sperm with its head (S) and axoneme (curved arrow) appears nearly normal in structure and position to that of group I. Note the presence of primary spermatocyte (SP) with euchromatic nucleus (N) and peripheral mitochondria (arrow head) (TEM × 3000).