[MT] Digestive System part 1 - Anal Canal

Acts as a storage area for fecal material before excretion.

rectum

Final segment of the digestive tract. Controls defecation through voluntary and involuntary mechanisms.

anal canal

lining of rectum

simple columnar epithelium

lining of anal canall

stratified squamous epithelium

The mucosa and submucosa of the anal canal form several longitudinal folds, the ____

anal column

The circular layer of the rectum's muscularis forms the _________

internal anal sphincter

Made of smooth muscle and controlled by the autonomic nervous system.

Internal Anal Sphincter

Defecation involves the action of voluntary muscle comprising the ______

external anal sphincter

Made of skeletal muscle, allowing conscious control of defecation.

external anal sphincter

chronic inflammatory bowel disease of the colon. Inflammation occur in any all layers of the colon producing pain, localized bleeding, malabsorption and diarrhea

Crohn disease

swollen blood vessels in the mucosa or submucosa of the anal canal. It is due to constipation (Low-fiber diet), prolonged sitting, or straining at defecation

Hemorrhoid

is an adenocarcinoma that develops initially from benign adenomatous polyps in the mucosal epithelium. Occur in the rectum, sigmoid colon, or distal descending colon. Common in individuals with low-fiber diets resulting in prolong contact of the mucosa with toxins in feces

Colorectal cancer

Anal canal Smooth muscle, involuntary control.

Internal Anal Sphincter

Anal canal Skeletal muscle, voluntary control.

External Anal Sphincter

Longitudinal folds with high vascularization.

Anal Columns