01:146:328 Lecture Notes - Lecture 4: Cecum, Polyembryony, Syncytium

• School: Rutgers University
• Department: Cell Biology and Neuroscience
• Course: 01:146:328
• Professor: A.Keating

Document Summary

September 13, 2018: introduction to trematodes, tree of life focusing in on kingdom animalia, phylum platyhelminthes. Bilateral symmetry and acoelomate (lack a body space) Class trematoda: subclass digenea (cid:523)(cid:498)2 origins(cid:499)(cid:524, at least 2 hosts in the life cycle, always snail 1st ih, flukes common name for digenea trematode, generalized life cycle of trematode, transmission in trematode life cycle miracidium to escape. Contains embryo miracidium (needs to infect a snail: egg figure 9. 15. Operculum looks like a lid that pops open during hatching process allowing: hatching stimulated by conditions different from internal environment, miracidium figure 9. 18, miracidium needs to hatch in ideal place to infect a sn ail. Correct cues cytolysis of snail tissue and penetrates host: new tegument has many microvilli (increase surface area for nutrient. Germinal sac embryo develops here: depending on species sporocyst may develop into: absorption). Exit sporocyst: cercariae, redia figure 9. 20, effect on trematode larva on snail host parasite castration.