Anus

Definition

The anus is the terminal end of the digestive tract where feces are expelled from the body. It plays a crucial role in the excretion process and is involved in maintaining gut health.

5 Must Know Facts For Your Next Test

1. The anus contains two sphincters: an internal and an external sphincter, which control the release of feces.
2. Normal microbiota of the anus include various bacteria such as Bacteroides, Firmicutes, and Escherichia coli.
3. Anorectal infections can be caused by pathogens like Human Papillomavirus (HPV) and certain strains of Escherichia coli.
4. Inflammatory conditions affecting the anus include hemorrhoids, anal fissures, and proctitis.
5. Proper hygiene and understanding the normal microbiota are essential in preventing infections related to the anus.

Review Questions

• What are the primary functions of the internal and external anal sphincters?
• Which bacteria are commonly found as part of the normal microbiota in the anus?
• Name two common anorectal infections and their causative agents.

Related terms

Rectum:

The final section of the large intestine, ending at the anus.

Escherichia coli:

A common bacterium found in the gut that can be both harmless or pathogenic.

Proctitis: Inflammation of the lining of the rectum.