Rectum

Definition

The rectum is the final section of the large intestine, terminating at the anus. It plays a critical role in storing feces before they are excreted from the body.

5 Must Know Facts For Your Next Test

1. The rectum is typically around 12 cm long in adults.
2. It acts as a temporary storage site for fecal matter before defecation.
3. The rectum has a rich blood supply, making it susceptible to conditions like hemorrhoids and rectal bleeding.
4. It contains stretch receptors that signal the need to defecate when filled with stool.
5. Anatomically, the rectum follows the curvature of the sacrum and can be assessed during a physical examination through digital rectal exam (DRE).

Review Questions

• What is the primary function of the rectum in the digestive process?
• How long is the average adult rectum?
• What condition might occur due to the rich blood supply in the rectum?

Related terms

anus: The opening at the end of the digestive tract through which feces are expelled.

large_intestine: A part of the digestive system where water absorption occurs and stool is formed.

hemorrhoids: Swollen veins in or around the anus and lower rectum that can cause discomfort and bleeding.