BIOL 1050 Lecture Notes - Lecture 1: Somatic Nervous System, Parasympathetic Nervous System, Sympathetic Nervous System

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30 Nov 2018
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Sensory input integration in the cns motor output. Input: sensory receptors, monitor stimuli inside and outside of body. Integration: processes and interprets sensory inputs, decides what to do. Output: activates muscles or glands (effectors) via motor output. 2 categories of the nervous system; central and peripheral (cns and pns) Sensory/afferent: somatic & visceral fibres (carry impulses from sensory receptors to the cns, cell bodies are outside the cns. Parasympathetic nervous system- restorative functions and relaxation of the body. Interneurons: connect motor and sensory neurons (in the cns) 2 types of cells in nervous tissue: supporting cells (neuroglia/glial cells) Contain cell body- metabolic center within a nucleus surrounded by a cytoplasm. Dendrites- electrical signals towards cell body (there are up to hundreds of these depending on neuron type) Axons- electrical signals away from cell body (each neuron has only one axon) Schwann cells make up the myelin sheath for cells outside the cns.

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