Male Reproduction QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. Penis External reproductive organ Composed of spongy tissue that contain many blood vessels Shaft and glans • Shaft is the main part of the penis • Glans is the tip Testicals/Testes Two small glands that produce sperm Located in the scrotum Also produce testosterone • Increase in testosterone production as puberty progresses Scrotum Home for the testicles Protects sperm be regulating the temperature to about 98.6 degrees Cold temperatures cause the scrotum to decrease in size. Warmer temperatures cause the scrotum to increase in size. Urethra A small tube that extends from the bladder as well as from each of the vas deferens QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. Epididymis and Vas Deferans Epididymis and Vas Deferans make up the duct system of male reproduction • Vas Deferans is a muscular tube that transports sperm containing fluid called semen • Epididymis is a set of colied tubes (one for each testicle) that connects to the vas deferens Prostate Gland A small gland that surrounds the urethra. It secretes fluids which become part of the semen Prostate Cancer is one of the most common forms of cancer among men.