ANP 1105 Lecture Notes - Lecture 4: Axon Hillock, Axon Terminal, Peripheral Nervous System
19 Sep 2016
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Dr. joanne savory and dr. m zeroual: cellular physiology of nerve and muscle (ch 11 - neurons) Nervous system consists of central nervous system (spinal cord and brain), and peripheral nervous system (nerve cells) Structural units of ns: conduct electrical impulses from one body part to another. Special features: extreme longevity (adequately nourished, it can live for 100 yrs+, amitotic (can"t divide to repair damaged cells) During infant ages, the neurons hippocampus of the brain (memory and emotion) divide quickly to let the child learn quickly: high metabolic rate (requires lots of mitochondria, o2 and glucose) Large, complex cells, all have a cell body (axon and dendrites) and one or more processes. Sensory nerves: receive information through touch, smell, sight, taste, hearing to the brain. Motor nerves: messages travel from the brain to the muscles. 3 functional regions of the axon: receptive region, conduction region, secretory region. Large, spherical nucleus with granular cytoplasm (biosynthetic centre)
