This question was sparked by the question on X is related posteriorly to Y where it was talking about the sigmoid and rectum.
When looking at the colorectal medical examination techniques, for want of a better term, there are the sopical examinations (those named with the suffix -scopy - involving the use of in instrument for viewing).
From what I understand, you have colonoscopy (examination of the entire colon with an endoscope) and sigmoidoscopy (examination of the sigmoid colon with an endoscope).
Is there such an examination as anusoscopy or rectumoscopy? What about colorectoscopy?