01:119:116 Lecture Notes - Lecture 18: Central Nervous System, Peripheral Nervous System, Spinal Nerve

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Nervous system organization: c/c animal nervous systems. Peripheral ns: seq ns pathway, c/c cns and pns. Vertebrate brain: seq brain development, c/c brain structures. Bacteria sense and react to their environment bya. As size increases, survival and reproduction in changing environment tends to increase. Greater body complexity greater nervous system complexity (see figure 49. 2) Ns arranged in a nerve net interconnected neurons and connections between them. Body receives impulses in both directions, signals spread through net. Have nerve ring central control structure in center of star. Platyhelminthes planarians: simplest clearly defined cns. Has brain and eyespots at anterior (cephalization) Ladder-type ns: (1) 2 longitudinal nerve cords (2) transverse nerves ( rungs ) allows for more precise movement of a certain part of body. More complex brain can have high degree of cephalization (arthropods) or low degree (annelids) Ganglia segmentally arranged clusters of neurons. Allow for precise movement central nerve cord sends signals out to neuronal clusters.

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