Testes are the male reproductive organs. Each testis contains about 250 testicular lobules or compartments. Sperms are produced in seminiferous tubules and each testicular lobule contains around 2-3 seminiferous tubules. They constitute around 90 per cent of testicular volume.
A seminiferous tubule is a coiled structure, which is about 150 µm in diameter and 80 cm in length. The wall of seminiferous tubules is made up of three layers of tissues, outer tunica propria, basal lamina and stratified epithelial layer. The epithelium consists of two types of cells:
- Male germ cells or spermatogenic cells
- Sertoli cells – nutritive cells
In the seminiferous tubules differentiating spermatogenic cells at different stages of spermatogenesis can be seen in an orderly fashion.
Leydig cells are found outside the seminiferous tubules in the interstitial spaces. They synthesise and secrete androgens.
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