Page 804 - Atlas of Histology with Functional Correlations

Stain: hematoxylin and eosin. Plastic section. ×125.

FIGURE 20.8 | Primate Testis: Different Stages of

Spermatogenesis

Three stages of spermatogenesis are illustrated. In the left illustration (I), the

large primary spermatocytes (5) divide to form smaller secondary
spermatocytes (3), which undergo rapid meiotic division to produce the
spermatids (1, 2). Both the early spermatids (2) and the mature spermatids (1)

become embedded deep in the Sertoli cell (4) cytoplasm. Located at the base of
the seminiferous tubule are the dark and pale type A spermatogonia (6).

In the middle illustration (II), the spermatids (7) are near the lumen of the
seminiferous tubule before their release. Also the early, round spermatids (8)
and the large primary spermatocytes (9) are associated with the Sertoli cells

(10). Near the base of the seminiferous tubule are the spermatogonia (11).

In the right illustration (III), the mature spermatids have been released as
sperm (spermiation) into the seminiferous tubule, and the germinal epithelium
contains only early spermatids (8), primary spermatocytes (9),

spermatogonia (11), and the supporting Sertoli cells (10).

FIGURE 20.8 ■ Primate testis: different stages of spermatogenesis. Stain:
hematoxylin and eosin. High magnification.

FIGURE 20.9 | Ultrastructure of Sertoli Cell and

803