95 Internal Features: Using scissors, cut through the body wall along the sides of any two arms. The body wall is particularly thick where two arms adjoin the central disk. Extend your cut along the entire aboral surface of the central disk. Lift up the aboral body wall, leaving internal organs in place, and severing the madreporite connection with care. 1. Note that the organs exist in a spacious coelom . The inner surface of the body wall is covered by a coelomic epithelium called the peritoneum . 2. The "antler-shaped" rectal cecum may be observable near the centre of the aboral axis; it is about 0.5 cm long, branched, somewhat glossy, and reddish-brown in color; its function is unknown. It attaches at the junction of the rudimentary intestine (which cannot be observed readily) and the aboral portion of the stomach 3. The delicate, star-shaped pyloric stomach bears connections radially through 5 pyloric ducts to 5 sets of paired pyloric ceca (digestive glands), located aborally in the arms. 4.
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This note was uploaded on 12/27/2011 for the course BSC 1020 taught by Professor Danmoon during the Fall '11 term at UNF.