Fig. 3

Photomicrography of spermatogenic cells during the germinative phases. a,b,c,d,e,f,g Proliferative phase: a schematic design demonstrating the similarities of spermatogenesis between the species and differences in the spermatozoa; b,c,d spermatogonia (SgA) with mitochondria (Mi) and nuages (N); e,f,g B spermatogonia (SgB) forming cell nest and Sertoli cell (S) with presence of nucleus (n); h,i,j meiotic phase; h spermatocyte in pachytene (pa); i spermatocyte in leptotene (le); j spermatocyte in diplotene (di); k,l,m,n,o,p spermiogenic phase; k final spermatids (St), in detail, the presence of the proximal (p) and distal (d) centrioles and mitochondria (Mi); l initial spermatids (St), nest cell, nucleus (n), vesicles (v) and mitochondria (Mi); m intermediate spermatids with spherical nucleus (n); note intermediate spermatid showing deep nuclear fossa (arrowhead); n,o,p spermatozoa with head (h), midpiece (Ip) and flagellum (f),secretion (*); note, longitudinal view of Sz, showing a nuclear fossa; spermatozoa with oval nucleus (n), detail of head (h). Scale bar: light microscopy-b,f: 10 μm; TEM- c-e, g-j: 5 μm, k-m: 2 μm, insert: 500 nm; SEM—n,p: 2 μm, insert: 1 μm