Nervous System April 16

Nervous System April 16 - Nervous System April 16, 2009...

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Nervous System April 16, 2009 Nervous System: -Instanteous response -contrasts with endocrine which takes seconds or mins to affect tissues CNS-brain and spinal cord PNS- all neurons and projections of their plasma membrane that are outside of the CNS Size of cerebrum and surface area of cerebral cortex (convolutions) increases with more complex neurons systems Basic Organization A. Somatic nervous system a. Skeletal muscles, can actively control them B. Autonomic Nervous system a. Sympathetic nervous system (fight or flight response) increases heat rate and breathing rate b. Parasympathetic nervous system (body at rest system) decreases heart rate and breathing rate -Neuron is the basic functional unit of the nervous system Neurons -cells that send and receive electrical stimuli to/from other neurons -all animals except sponges neurons -number varies widely as a function of size and behavioral complexity Neuron Structure -cell body or soma – contains nucleus and organelles -dendrites -may be single or branching -incoming signals -axons -typically single -send signals -axon hillock near body -terminal branches or nerve terminal at far end Myelin Sheeth -schwann cells ( in PNS) or oligodendrocytes (in CNS) wrap around axon during
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This note was uploaded on 09/15/2009 for the course BIOE 20B taught by Professor Williams during the Spring '09 term at UCSC.

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Nervous System April 16 - Nervous System April 16, 2009...

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