• Rectum: The terminal part of the large intestine that ends into the anal canal
• Anal canal: The last part of the digestive system beyond the rectum
• Veins: Blood vessels that carry oxygen-depleted blood from different part of the body towards the heart
• Incontinence: Involuntary or unintentional passage of urine or stools
• Stenosis: Abnormal narrowing of a passage or its opening