the reduction in testis weight during sexual regression ( reduced to 35 % of active ) was due to a decrease in the diameter of the seminiferous tubules with extensive involution of the basement membrane , a marked reduction in the number of germ cells maturing beyond the spermatocyte stages , and a general disorganization of all but the most basal region of the seminiferous epithelium .
C0039597
testis
C0036630
seminiferous tubules