Structure and Function of the Normal Testis and Epididymis

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Abstract
The structure and function of the testis and epididymis are described, emphasizing the general similarities and specific differences between various species and humans. Current concepts of spermatogenesis are reviewed and the developmental stages of the germinal epithelium are discussed, as well as the complex hormonal interactions that take place. It is crucial to recognize that the efficiency of sperm production and the epididymal reserves in the human are considerably lower than those of conventional animal models. Therefore, the human male is more susceptible to a decline in fertility caused by a specific decrement in spermatogenesis than is an animal model.