The goal of this morphometric study was to obtain quantitative information on the seminiferous tubules of Sprague-Dawley rats, including changes seen at various stages of the cycle of the seminiferous epithelium. Tissue from perfusion-fixed testes was embedded in Epon-Araldite; and sections were subjected to morphometric measurements at the light microscopic level, using point counting for volu...

objective: melatonin, the pineal gland hormone as a direct or indirect antioxidant and free radical scavenger, is involved in the process of both aging and age-related diseases. this study investigates the effects of melatonin on the histology of testicular seminiferous tubules in aged mice. materials and methods: twenty male, white mice, aged 16 months, that weighed 20-23 gr were equally divid...

  SUMMARY The testes of five wistar rats 2 months after bilateral vasectomy was compared with those of sham­operated controls. Aims were to determine whether there are any changes in the wistar rat testis after vasectomy. Two testis in the vasectomized group displayed histological changes, which consisted of depletion of germ cells, vacuolation in the epithelium, folding of basement membrane ...

INTRODUCTION Connexin 43 (Cx43) mediates the effect of thyroid hormone on Sertoli cell maturation in vitro. We investigated the influence of triiodothyronine (T3) administration on Cx43 expression in relation to the progress in seminiferous tubule maturation. MATERIAL AND METHODS Male rats were daily injected with 100 µg T3/kg body weight from birth until postnatal day (pnd) 5 (transient trea...

PURPOSE To investigate the seminiferous tubule histological morphology after an 8 mmHg pneumoperitoneum in the rat model. METHODS Fourteen rats were divided into two groups: a Sham group submitted to anesthesia and a pneumoperitoneum (Pp) group submitted to abdominal insufflation at 8 mmHg during three hours, followed by desuflation. All rats were killed after six weeks, testicles were collec...

The spermatogenesis of Pseudis limellum, from the Southern Pantanal, Brazil, was studied from July 1995 to May 1996, through histological sections of the testis. The cells could be differentiated as: primary spermatogonia, large cells, generally with bilobed nucleus; secondary spermatogonia, smaller cells, with darker cytoplasm, chromatin of radial form; primary and secondary spermatocytes, dif...

OBJECTIVES: Considering the possibility that alcoholism induces gonadal dysfunction, the present work was designed to investigate the morphophysiology of rat testes submitted to experimental alcoholism. METHODS: Male Sprague-Dawley rats weighing 150 ± 5 gm were chronically given 40% ethanol solution at a dose of 3 g/kg body weight for 30 days. 3H-thymidine autoradiographic investigations and hi...