Marine stickleback populations live and breed strictly in the ocean. Sea-run stickleback fish are. anadromous, meaning that they are born in fresh water, spend most of their lives in the ocean, and. return to fresh water to breed. Freshwater stickleback fish live entirely in fresh water.
Among patients with Crohn's disease, 4% will have an anal fissure as the first manifestation of their Crohn's disease, and half of all patients with Crohn's disease eventually will develop an anal ulceration that may look like a fissure.
fissure. n. 1. any long narrow cleft or crack, esp in a rock. 2. a weakness or flaw indicating impending disruption or discord: fissures in a decaying empire.3. (Anatomy) anatomy a narrow split or groove that divides an organ such as the brain, lung, or liver into lobes.See also sulcus. 4. (Medicine) a small unnatural crack in the skin or mucous membrane, as between the toes or at the anus. 5.ilum, hilus - (anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ; the hilus of the kidney. anatomy, general anatomy-the branch of morphology that deals with the structure of animals.