Contracture is the medical term meaning constriction of tissue.
atresia
The lumen is the space within the blood vessel (or within any tubular structure).
A term for a tubular structure is "cylinder."
peristalsis
Diverticulitis is the inflammation of one or more diverticula.
diverticulum
The medical term for circular muscle found in tubular structures that regulates the passage of substances is "sphincter." Sphincters act as valves to control the flow of fluids or materials through tubular structures in the body.
a centriole.
Stent.
A diverticulum (plural diverticula) is an abnormal pouch found in the wall of a tubular organ. The esophagus and colon may have diverticula.
Intraluminal refers to something situated within the space or lumen of a tubular structure in the body, such as a blood vessel or intestine. It is often used to describe things like catheters or obstructions that are inside a tubular space.
urether