November 13 Lecture - November 13, 2008 Term Test:...

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November 13, 2008 Term Test: Articulations to End of Nervous System The Nervous System - Complex system, highly specialized in function and structurally - Extensive system – widespread in body o Involves virtually all tissues of the body - Nervous system is divided into two portions o Central Nervous System (CNS) Portion of nervous system that is foundational for many functions Includes brain and tissues which make up the spinal cord o Peripheral Nervous System (PNS) Remaining portion of nervous system, includes: Cranial nerves o Nerves that have their origins emanating from the brain Spinal nerves Ganglia o Cluster of cell bodies of nerves, grouped together in bundles called ganglion Autonomic nervous system (ANS) Functional Perspective of the Nervous System - Two groups of fibres o Afferent fibres Fibres involved in conveying sensory information toward nervous system Brings information from receptors which are located in various peripheral structures (tissues or organs) Ex. the skin Receptors can be simple (free nerve endings) while others are highly specialized Ex. the eye is a receptor that receives photostimulation which is complex and finely structured, and is referred to as an organ The ear also is a sophisticated receptor Moderately sophisticated: touch, pressure, and taste receptors Simple: thermal receptors in skin o Efferent fibres Involved in carrying commands in the opposite direction: from the central nervous system out to the “effector” organs or tissues This information is used by the organs or tissues to respond to what ever is being transmitted Generally, these tissues are muscle or glandular tissues Two subdivisions: Somatic efferent neurons (somatic nervous system – SNS) o Involved in regulation of muscle activity
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o Controls skeletal muscle contractions, voluntary contraction which is under conscious control
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November 13 Lecture - November 13, 2008 Term Test:...

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