Anatomy and Cell Biology 4451F/G Lecture Notes - Lecture 2: Optic Vesicle, Midbrain, Mesen
16 Sep 2017
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C. elegans: 2-3mm long, 302 neurons, 5000 chemical synapses, 200 gap junctions. We know nt that each neuron releases. Good to study nervous system but not a brain. Lower order animals have primitive neural system, diffuse. Leech is bilateral same with neural system, condensates instead of diffuse evenly distributed, here we have nerves axons and processes of neurons clumped together. Snail can see ganglions, cell bodies of neurons start to clump together, mostly at head of animal, can see abdominal and others too, see condensation, neurons come together form together, connect ganglions to periphery of animal. First brains we see when we move to vertebrae spinal cord central nervous system. Fish primitive brains and spinal cords that give way to nerves to periphery. Huge area of brain dedicated to processing olfaction, see midbrain, cerebellum, forebrain, hindbrain, spinal cord. Rodents: see general structure of spinal cord, cerebellum, midbrain, cortex, huge olfactory bulbs at rostral end of brain.
