Nervous System II

Nervous System II - Lecture #2 (Nervous System II) I....

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Lecture #2 (Nervous System II) 26/06/2008 15:10:00 I. General function A. Acquireing information=sensory input Afferent neurons (approaching) PNS B. Processing Information= integration Interneurons CNS C. Sending out commands (responding)= motor output (thoughts) Efferent neurons (exciting) PNS D. 2 main branches  of the vertebrate nervous system 1. Central Nervous system (CNS) i. Brain and spinal cord 2. Peripheral Nervous system (PNS) i. Everything else (figure 4)
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II. Organization A. Cniderians Nerve net (radially symmetrical) No CNS Neurons not specialized Signal transmission can be unpolarized(multidirectional) o Ex. You can touch one tenticle and another part of the body will recognize the impulse. B. Cephalization (bilaterally symmetrical animals)= concentration of integrating parts of the nervous system at the  anterior end (head) of the animal  brain or integrating center signal transduction is polarized (unidirectional) 1. Ganglionic nervous system -ganglion=collection of cell bodies (and dendrites), interconnected for integration (~for vertebrates  only in PNS) -in ganglionic nervous systems, CNS comprised entirely of ganglia and connectives - connectives= bodies of axons that carry signals beween ganglia 2. Columnar nervous sytem (vertebrates) CNS= brain and spinal cord Brain= complex integrating center, made up of nuclei and tracts Nucleus= collection of cell bodies and dendrites in the brain
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Tract= grouping of axons
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Nervous System II - Lecture #2 (Nervous System II) I....

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