Some histochemical and ultrastructural observations on the early foetal pig testis.
نویسندگان
چکیده
Testes of foetal pigs between 26 to 35 days post coitum (p.c.) were investigated histochemically and ultrastructurally. Diaphorase and delta 5-3 beta-hydroxysteroid dehydrogenase activities were studied using, respectively, NADH and pregnenolone and dihydroxy androsterone as substrates. Ultrastructurally, attention was focused on the development of mesenchymal cells and on the sustentacular cells in the primitive sex cords in an attempt to detect the origin of Leydig cells. Histochemically there is a concentration of activity toward the interstitium with increasing age. Also the reactions increase in intensity. Ultrastructurally no evidence for Leydig cell development from Sertoli cells could be observed. Mesenchymal cells between the sex cords show a development toward Leydig cells. This is absent in mesenchymal cells in the future tunica albuginea. Before 30 days p.c. no 'true' Leydig cells can be observed morphologically. The role of the rough endoplasmic reticulum/mitochondrial complex, which is present in many mesenchymal and sustentacular cells, is discussed.
منابع مشابه
Histological, histochemical and ultrastructural characterizations of the epididymal region of the turkey (Meleagrisgallopavo)
Histological, histochemical and ultrastructural studies were performed on the epididymal regions of ten adult sexually mature apparently healthy male native turkeys (Meleagrisgallopavo). The epididymis of turkey was consisted of extra testicular rete, efferent ductules, connecting ductules, and the epididymal duct. The rete testis were lined by squamous to cuboidal cells, while the proximal eff...
متن کاملLong-Term Effect of Aspartame on Male Reproductive System: Evidence for Testicular Histomorphometrics, Hsp70-2 Protein Expression and Biochemical Status
Background: Aspartame is one of the most commonly consumed artificial sweeteners that is widely used in foodstuffs.There are many debatable reports about aspartame toxicity in different tissues; however, on the subject of itseffects on the reproductive system, few literatures are available. The present study was carried out for evaluating effectsof aspartame on the reproductiv...
متن کاملSertoli cell nodules in the undescended testis: a histochemical, immunohistochemical, and ultrastructural study of hyaline deposits.
AIMS To document the morphology, immunohistochemical staining properties, and ultrastructural features of hyaline material in Sertoli cell nodules of undescended testis and contrast them with those of sex cord tumour with annular tubules (SCTAT), which is histologically similar. To highlight the need to distinguish these nodules from other Sertoli cell hyperplasias, such as intratubular Sertoli...
متن کاملUltrastructural changes in pig hepatocytes during the transitional period from late foetal to early neonatal life.
A lightand electron-microscopic study of pig hepatocytes from late prenatal to early neonatal animals shows changes which reflect an increasing rate of synthetic activity. The granular endoplasmic reticulum (ER) in the prenatal pig hepatocyte is situated along the periphery of the cytoplasm and in the region immediately surrounding the nucleus. Mitochondria are most abundant in the area adjacen...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Journal of embryology and experimental morphology
دوره 95 شماره
صفحات -
تاریخ انتشار 1986