362 
PACIFIC SCIENCE, Vol. V, October, 1951 
Fig. 3. Diagrammatic reconstruction of the right testis to show: a, paniculate anterior portion; b, paniculate 
posterior portion; c, tube which ultimately drains regions a and b\ d, mid-testis; e, vas deferens. (IX) 
Figure 4 is a cross section through an im- 
mature follicle taken through the anterior 
part of the testis (Fig. 2/). It should be borne 
in mind, however, that sections taken through 
the mid-portion of the testis (Fig. 2e) or the 
posterior portion of the testis (c) would re- 
veal follicles of similar maturity, and these 
would also be associated with other follicles 
of varying degrees of maturity. The entire 
follicle is filled with large, primary spermato- 
cytes (Fig. Ah'). These cells measure 15 to 20 
microns in diameter and contain nuclei that 
may attain a diameter of 10 to 14 microns. At 
this particular stage it is impossible to dis- 
tinguish the primary spermatocytes from the 
seminiferous epithelium (Fig. 4c). 
Fig. 4. Camera lucida drawing of portion of testis 
(Fig. 2/). a. Connective tissue; b, primary spermatocyte; 
c, seminiferous epithelium. (125 X) 
A transverse section (Fig. 5) as far pos- | 
terior as the mid-testis (Fig. 2e) reveals fol- | 
licles, some of which are more mature than j 
that illustrated by Figure 4. Follicles at this I 
stage of maturity likewise can be observed in 
transverse sections throughout the length of 
the testis, and these would also be associated 
with other follicles of varying degrees of ; 
maturity. A lumen (Fig. 5g) and radiating ‘ 
cells (c) present a wheel-like appearance in 
this stage of development. Whereas in 
Figure 4 the follicle is filled with a homo- 
Fig. 5. Camera lucida drawing of a small portion of 
testis (Fig. 2e). a, Cumulative tissue; b, peripheral 
layer of epithelium; c, Sertoli cells; d, primary sper- 
matocytes; e, secondary spermatocytes; f, spermatids; 
g, central lumen formation; h, disintegrating primary 
spermatocytes. (80 X) 
