a histological study of the testes of stags shot in autumn ( sexual season ) and spring ( quiescent period ) indicated that the 3-fold increase in testicular size observed in the autumn was accompanied by increases in nearly all features studied ( volumes of intertubular tissue , leydig cells , blood vessels and peritubular cells ; diameter and length of seminiferous tubules ; the number of a1 spermatogonia and products of spermatogonial divisions , meiosis and spermiogenesis ) .
C0036630
seminiferous tubules
C0037866
spermatogonia