NATS 1675 Lecture Notes - Nerve Net, Mesoglea, Neuron

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Invertebrates: coelenterates: (sea anenamie, bottom of sea with lots of tentacles, in sea water) Animals with 2 body layers (no middle) inside & outside do not have n. s. In the wall of coelenterate consists of outside & inside, is a single layer of cells with a space in b/w (2 layers not touching each other) which is filled with ecf mesoglea. The animals nerve cells are located in the mesoglea (look in notebook for figures) In most coelenterates have cell body with nucleus in it. Nerves form a net if looking at organisms in a flat view, interconnected nerve cells form a network of cells in either the inside/outside layer of animal. Two types of nerve nets: one associated with each of the 2 layers in the animal"s body. These nerve nets cannot connect/talk to each other except for 1 place: around the animals mouth hole in the middle where all the tentacles surround/meet together.

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