Morphological Changes of Mammalian Nucleoli during Spermatogenesis and Their Possible Role in the Chromatoid Body Assembling
Figure 4
Ultrastructural analysis of Oryctolagus cuniculus germ epithelium. (a) Spermatogonia with central reticulated nucleolus (nu) organized. (b, c, and d) Primary spermatocytes in the pachytene stage with no organized nucleolus and possessing synaptonemal complex and ribonucleoprotein accumulation in the cytoplasm (*). Ribonucleoprotein could join later with mitochondria (m), or it could remain isolated. (e and f) Round spermatids with reorganized nucleolus (nu) and CB (*) linked to mitochondria aggregates next to the acrosomal system region (a). (n: nucleus; nu: nucleolus; m: mitochondria; *-chromatoid body; a: acrosomal system). Bars = 10 μm.
