Figure 4.

(a–e) Ultrastructural micrographs of the non-irradiated testis featuring the presence of: (a) Type A spermatogonia resting on the tubular basement membrane (BM) with its euchromatic oval nucleus (N) and scanty cytoplasm, Sertoli cell with irregular indented nucleus (n), prominent nucleolus (nu), cytoplasm full with mitochondria (M), smooth endoplasmic reticulum (S), strand of rough endoplasmic reticulum (R), small lipid droplets (L); a tight junction appears between the cell membranes of adjacent cells above the spermatogonia (arrow) (×5000); (b) Type B spermatogonia with its rounded nucleus (N)and course clumps of chromatin. Tight junction appears between the cell membranes of adjacent Sertoli cells above the spermatogonia (arrow). Myoid cell (MY) with oval, flattened nucleus is seen beneath the BM (×5000); (c) Primary spermatocyte with normal nucleus (N). The cytoplasm contains mitochondria, smooth endoplasmic reticulum, rough endoplasmic reticulum and Gogli body (GO). Note, the tight junction between the cell membranes of adjacent Sertoli cells below the spermatocyte (×5000); (d) transverse sections of the axoneme of the mid-piece of the sperm tail of some spermatozoa (SP), parts of normal spermatids with spherical nucleus (N) and fine granular chromatin. The cytoplasm contains parts of Golgi body residing close to the acrosomal vesicle (A), mitochondria and vesicles (v) (×4000); (e) interstitial cell of Leydig with rounded nucleus and peripherally arranged dense chromatin. The cytoplasm is predominantly filled with mitochondria and smooth endoplasmic reticulum (×5000).