BIOL-UA 12 Lecture 19: Lecture 19_ Nervous System
18 Mar 2016
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Flow of information: (1) sensor in the eye (2) central nervous system integrates the sensory input and yields a motor output (3) effector: motor response this all happens because neurons communicate and circuits throughout the body. There are more aspects than just neurons; Nerves = bundles that consist of the axons and of multiple nerve cells. Each single-celled can respond to stimuli in its environments. Animals are multicellular most groups respond to stimuli using system of neurons. Glia = functions: nourish, support and regulate neurons. Embryonic radial glia = form tracks along newly formed neurons migrate. Blood-brain barrier = restricting entry of substances to the brain with astrocytes induce cells lining capillaries in cns to form tight junctions. The more complex the body organization, the more complicated the nervous system layout (simple nervous plans can infer less developed brain) (1) central nervous system (cns) = brain and spinal cord. (2) peripheral nervous system (pns) = output of central nervous system.
