The male reproductive system consists of the hypothalamic-pituitary unit, the testes, the reproductive tract, and the external genitalia. The functions of the male reproductive system are to produce and deliver spermatozoa, for sexual reproduction, and produce hormones that regulate reproductive function and secondary sex characteristics. Abnormalities in anatomic or physiologic function affect the development and delivery of spermatozoa, and potential fertility. Male factors are often the cause of a couple's failure to conceive, therefore, it is important to evaluate and treat the male partner. A male factor may be due to abnormalities of hormonal control, testicular function, or sperm transport or delivery. This book provides a comprehensive review of the clinical anatomy and physiology specific to male reproductive system, emphasizing causes and management of male infertility. By developing a clear understanding of what is normal, you will better understand abnormalities affecting male fertility and the mechanisms behind treatment.