BIOLOGY OF SPERMATOZOA 



717 



Fig. 13.3. Representative sections of rat epididymis, approx. 750 X- (D Zone lA; basal, 

 principal, and apical cells visible. (£) Zone 4B; principal cells with perinuclear vacuoles. (3) 

 Zone 3; clear cytoplasm in supranuclear areas. (4) Zone 4A (late); prominent vacuoles m 

 supranuclear areas. (5) Zone IC: basal, principal, apical, and halo cells. (6') Zone 5A ; low 

 columnar principal cells. (7) Zone 5A ; as in (6'); note clear cell at C. iS) Zone 4A (early); 

 strings of small vacuoles in .supranuclear regions. (From B. L. Kcid and K. \^ . Cleland, 

 Australian J. Zool., 5, 223-246, 1957.) 



