M M & I 350 Final: FINAL EXAM STUDY GUIDE

• School: UW-Madison
• Department: Medical Microbiol & Immunology
• Course: M M & I 350
• Professor: All

Document Summary

General characteristics: round worms, unsegmented, tube within a tube, complete digestive system, bilateral symmetry but with body cavity (not true coelum since not derived from mesoderm pseudocoelumate ) Dioecious separate sexes that are usually sexually dimorphic. Outer layer = acellular cuticle that must molt to grow. Unique muscle cells connect directly to nerve cord: muscle cells are longitudinal cannot elongate themselves, movement ~ whip, where innervation for contraction = dorsal (top) vs. relaxation of muscles = ventral (bottom) Turgor pressure is very high (~200 mmhg) Stomodeum, or buecal cavity = mouth with armaments (cutting plates); pharynx is extremely muscular to pump in food contains one-way valve. Cloaca: opening for both reproductive and digestive tract. Spicules: hold vulva of female open to allow sperm inside. Gubernaculum: protects from piercing self with spicules. Characteristic bent tail for holding female during copulation. Separate openings for reproductive and digestive system. Ovijector: muscular constrictor, used to squirt eggs out.