male reproductive system. testicular anatomy. cross section

anatomy man human testicles genital testicular testis sperm diagram anatomical system reproductive male epididymis organ spermatic testicle reproduction structure medical scrotum medicine ductus internal health urogenital vector rete seminiferous tubules septum tunica albuginea urinary prostate mal sperms testes appendage lobules education gonad spermatozoa biology cross section studying