PHGY 209 Study Guide - Final Guide: Dense Irregular Connective Tissue, Neuroglia, Dura Mater
15 Feb 2018
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Overview: divided into central nervous system (brain and spinal cord) and peripheral. Nervous system (afferent and efferent divisions consisting of cranial and spinal nerves). Receptor->sensory (afferent) division ->central nervous system ->motor (efferent) Division-> somatic nervous system (voluntary, skeletal muscle) or -> autonomic. Nervous system (involuntary) : sympathetic nervous system, parasympathetic and. Enteric nervous system -> effector (muscles or glands) Detect changes in external environment (exteroreceptors: photoreceptors in retina of the eye (electromagnetic receptor) taste buds ( chemoreceptor) In skin : heat, cold, light touch, pressure and pain receptors) or internal environment (interioreceptors: proprioreceptor (muscles and tendons stretching, blood pressure monitor. Microscopy: nervous tissue is composed of 2 major types: neurons (nerve cells) and neuroglial cells (or glial cells, smaller and more numerous, supporting neurons). There are 6 types of neuroglial cells (4 in cns and 2 in pns). They insulate, increase speed of nerve impulse (saltatory conduction) and are vital to regeneration of peripheral nerve processes.
