BIOL211 Lecture Notes - Elastic Cartilage, Arteriole, Ciliary Body
4 Feb 2013
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Notes for biol 211 intro to vertebrate zoology part 2. Lecture 13-14 coelomic cavities, mouth, and digestive system. Origin of the coelom and gut membrane separating pleural and pericardial cavity = mediastinum. The scrotum = extension of the peritoneal cavity. In cyclostomes, both remain on top of head and stomodeum is shallow. In fish, only the hypophyseal pouch is drawn into the stomodeum. In vertebrates with choanae or internal nares --> both hypophyseal pouch and nasal epithelium are drawn into the stomodeum. Organs of gut develop as evaginations of the gut into mesenteries. Coelomic space is split in the hypomere. In hagfish, and some sharks --> the coelom and peritoneal cavity is undivided. In most fishes and amphibia --> heart in pericardial cavity is divided and separated from the peritoneal cavity by the transverse septumheart behind gills. In reptiles --> heart is under lungs. In mammals --> lungs in pleural cavitydiagphram separates pleural and peritoneal cavities.
