LIFESCI 2A03 Lecture Notes - Lecture 6: Thymidine, Cestoda, Chromosomal Translocation
22 Oct 2013
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Molecular basis of regeneration: planarians as a model system. The problem of regeneration alejandra sanchez alvarado, jan 2007 http://www. ibioseminars. org/sanchez/sanchez3. shtml. Day 2 unpigmented area; forming epithelium. Day 3 regeneration blastema; white pigmented tissue. Day 4 beginning of photoreceptors (notice anlage); neurons form, pigment cups form, photoreceptors emerge. Day 5 complete differentiation of missing structures. Day 7 planaria completely competent to respond to light, food, touch: schmidtea mediterranea bilaterally symmetric; derivatives of all 3 germ layers form. Complex organ system that sit on top of each other (layers) Gastrovascular system food processing to serve as a source of carbon; enters through single opening (part of pharynx) to gut, then dispersed to body; food not digested is excreted from same pharyngeal opening. Excretory system protophrania; dorsal surface, equivalent to kidneys, two cephalic ganglia sitting on top of 2 ventral cords that traverse to top of animal; neuronal contact between two ventral cords that traverse to anterior-posterior axis.
