Figure 5.

An electron micrograph of a section from the testis of a rat from the group I showing a spermatid (SD) with a rounded euchromatic nucleus (N) covered on the proximal part of its circumference with acrosomal vesicle (crossed arrow) and acrosomal granule (Ag). The cytoplasm shows peripherally-arranged mitochondria with clear matrix (arrow head) as well as a well-developed golgi apparatus at one side of the nucleus (G). Note the presence of the head of mature sperm had a pyramidal dark nucleus covered by acrosomal cap (S) and the transverse section in the middle piece (curved arrow) showed centrally located microtubules which form the axoneme of the mature sperm (TEM × 2500).