vesico-, vesic- +
(Latin: bladder; blister)
2. The bladder or a membranous sac serving for the reception of fluids or gases; such as, the swim bladder of some fish.
2. A blistering agent.
Vesicles also occur on the mucous membranes; such as, the buccal mucosa (the lining of the mouth).2. In anatomy, a vesicle is any small pouch; for example, the seminal vesicles are a pair of pouch-like structures located behind the bladder and above the prostate gland that contribute fluid to the ejaculate.
3. A small bulla, as seen in herpes simplex or chickenpox.
4. Etymology: the word vesicle comes from the Latin diminutive vesiculum, meaning "a small bag" or "bladder".
The fistula is an abnormal duct or passage resulting from injury, disease, or a congenital disorder that connects an abscess, cavity, or a hollow organ to the body surface or to another hollow organ.