BIO SCI E109 Chapter Notes - Chapter 7: Neuroglia
28 Sep 2016
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7. 2 neurons are responsible for the main functions of the nervous system. Neurons=nerve cells: basic functional unit of the nervous system: components of a neuron, three functional classes of neurons. Sensory receptors: peripheral endings(dendrites) of sensory neurons. [encapsulated (surrounded by a connective tissue capsule) or free] or separate cells located close to sensory neurons. Trigger zone for action potential: at the junction of the dendrites and the axon of the sensory cell. Convey action potentials away from the cns to effectors in the periphery. Characteristic: have numerous dendrites and one main axon extending from cell body. Located entirely within the cns between sensory and motor neurons. Responsible for integraton: process incoming sensory info and may elicit a motor response by activating the appropriate motor neurons. About 99% of all neurons in the body are interneurons sensory/afferent neurons [notice the shape] interneurons/association neurons motor/efferent neurons: neuroglia/glia provide physical, nutritional, and metabolic support to neurons.
