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Chapter 3 - The Anatomy of the Nervous System

Chapter 3 - The Anatomy of the Nervous System - A ATOMY OF...

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Aglyph1197ATOMY OF THE glyph1197ERVOUS SYSTEM (Chapter 3) RETURglyph1197 TO COglyph1197TEglyph1197TS Web links: Human Cerebral Cortex: lobes, gyri and sulci (fissures): http://www.marymt.edu/~psychol/brain.html Brain Atlases From: http://www9.biostr.washington.edu/ http://www.med.harvard.edu/AANLIB/home.html glyph1197euro Syllabus: Check chapters related to anatomy of the Nervous System. Some figures are not available on the Internet. http://www9.biostr.washington.edu:80/cgi - bin/DA/PageMaster? atlas:NeuroSyllabus+ffpathIndex/Master^Frame^Syllabus+2 To the naked eye, the Nervous system can be divided into two major parts (Figs. 3.1; 3.2): 1. The Central glyph1197ervous System , Cglyph1197S , protected by bone, divided into: Brain , located in the skull Spinal cord , located in the spine. 2. Peripheral nervous system , Pglyph1197S , which is not protected by bone, divided into: The somatic nervous system, interacts with the external environment: -Receives information: sensory function, afferent. (mnemonic: a rrive) -Mediates motor responses: motor function, efferent . (mnemonic: e xit) Autonomic nervous system. Regulates organs and glands .
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afferent (sensory) pathways from the organs to the CNS efferent (motor) pathways from the CNS to the organs. Two kinds of efferent nerves 1. Sympathetic nerves, for threatening (emergency) situations (escape, fight, etc) by stimulating and mobilizing energy resources. Emerge from the lumbar (small of the back) and thoracic (chest area) regions of the spinal cord. 2. Parasympathetic nerves, conserve energy (self-sustaining). Emerge from the brain and sacral (lower back) regions of spinal cord.
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