Subcellular structure of the luminal content of the cauda epididymidis of the opossum (Didelphis azarae).

The luminal content of the cauda epididymidis of the opossum has been studied by transmission electron microscopy. The content is represented by single and paired spermatozoa. Subcellular features of both spermatozoa and their cytological components have been described on the basis of the morphology of spermatozoa in the epididymis of other metatherian forms.