Relationships Among Testicular Size, Daily Production and Output of Spermatozoa, and Extragonadal Spermatozoal Reserves of the Dog

Abstract

The ultrastructure of the zonae pellucidae of hamster ova after treatment with zona precipitating antibody (ZPA) was investigated. The hamster zona as viewed by transmission and scanning electron microscopy reveals an intricate network of interconnecting fibers. This network of interstitial zona fibers results in the formation of a porous outer zona region adjacent to a more compact but porous inner zina. The canaliculi bounded by these fibers provide viaducts by which processes of follicular cells may pass through the zona and interact with the vitelline surface.