Listeria. Listeria is a bacterium that causes a serious infection called listeriosis. Around 300 deaths are caused by Listeria infection each year, according to estimates from a 2011 CDC report. Listeria bacteria are most commonly found in raw foods. Vegetables can be contaminated by soil and water carrying bacteria.
Human male reproductive system. The scrotum is the bag that holds the testicles (commonly called balls) in male mammals. It is made of skin and muscle and is found between the penis and anus. It is often covered in pubic hair and becomes tight when the male is aroused.
Reproductive System. The male reproductive system consists of testes, ducts, glands, urethra and penis. The testes (from splanchnic hypomere mesoderm) are located in an external pouch, the scrotum, which is a projection from the peritoneal cavity.Scrotal sacs have descended outside the abdominal cavity to keep the sperm cool.xcretory System. The structures of the excretory system are paired kidneys and ureters from mesomere mesoderm, and an unpaired urinary bladder and urethra. Locate the kidneys on the dorsal part of the abdomen on either side of the vertebral column, embedded in fat. Note a small adrenal gland anterior to each kidney.