Figure 7 : (A) Electron micrograph of adult albino rat testis of group A showing the earlyspermatid with its rounded heterochromatic nucleus (N).

Notice that its cytoplasm shows the peripheral arrangement of characteristic small mitochondria with clear matrix (m).
(B1) Electron micrograph of testis of adult albino rat of group B showing that the early spermatid has irregular outline (yellow arrow) with degenerated mitochondria (m) and shrunken irregular nucleus (N).
(B2) Electron micrograph of testis of adult rat group B showing that the early spermatid vacuolated cytoplasm(V), has degenerated mitochondria (m) and shrunken irregular degenerated nucleus (N).
(C) Electron micrograph of the testis of adult albino rat of group C showing the early spermatid with its characteristic mitochondria (m) and rounded heterochromatic nucleus (N).

Mohamed et al.Journal of Histology & Histopathology  2015 2:21DOI : 10.7243/2055-091X-2-21