This volume, and its companion volume on the oocyte, provide an authoritative and wide-ranging account of the gametes, and their reproductive role and function in humans. Acknowledged authorities from around the world provide a detailed and timely account of the spermatozoon. The volume starts with an evolutionary perspective before focusing on the molecular and cellular biology of the sperm cell, and its structure and function. The development and maturation of sperm are described, as is their movement and transport in the male and female genital tract. Practical issues such as sperm storage and assisted contraception are fully covered. The causes of male infertility are also an important theme. The volume concludes with a thought-provoking chapter on ethical considerations. The volume will be an essential source of information for all clinicians and scientists with an interest in human reproduction.