BZ 110 Lecture Notes - Lecture 1: Anticoagulant, Glycogen, Clitellum
Document Summary
Spiral cleavage, trochophore larvae, and schizocoelous coelom formation. Dorsal suprapharyngeal ganglia and ventral nerve cords with ganglia. Lophotrochozoans: do not have to molt in order to grow. Shared characteristics with arthropoda are probably convergent (not associated with a recent common ancestor) a. b. Schizocoelous coelom formation (mesoderm splits to create the body cavity) Segmental arrangement of body parts including many internal organ systems. Specialization of body regions for specific functions (more developed in insects (arthropods)) Sn palolo worm: people and animals feast on reproductive segments of them. Paired lateral extensions of body wall in each segment i. Lobe projecting dorsally and anteriorly from the mouth. The complete digestive tract is a straight tude suspended within the body cavity by mesenteries and septa. Segmental vessels and capillaries serve intestine body wall and parapodia. Nervous function a. b. c. d. e. f. Suprapharyngeal ganlia control sensory and motor functions involved with feeding and locomotion. Giant fibers of nerve cord mediate escape responses.
