Up to one-half the primary spermatocytes in a given tubule cross section are in the stage of synapsis where chromatin is concentrated to one side of the nucleus. A basal row of spermatogonia and Sertoli cells ring the basement membrane. Towards the lumen two to three rows of primary spermatocytes are in synapsis. A row of secondary spermatocytes lies toward the lumina of tubules. Peripheral to these are cells of previous stages.
Spermatids are present surrounding the lumina.
Intertubular cells are almost completely confined to the triangles formed by the meeting of three tubules. Rining the lumina are bundles of spermatozoa with their heads pointing toward the basement membrane. The lumina are filled with cytoplasm. This stage represents breeding condition. In this, the climactic stage of spermatogenesis, spermatozoa and cytoplasmic particles are present in the lumina.