LS 2 Review Central Nervous System

LS 2 Review Central Nervous System - LS 2 Review Central...

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LS 2 Review Central Nervous System (Ch. 46) I. Organization of the Central Nervous System (CNS): Brain and Spinal Cord a. The brain receives somatic (muscles/voluntary) and visceral (internal/within organ)information. (afferent) b. The brain sends (efferent) commands that can be somatic or autonomic . i. Somatic - SNS is part of the control of voluntary body movements. (PNS) ii. Autonomic -ANS controls part of the peripheral nervous system that acts as a control system functioning largely below the level of consciousness, and controls visceral functions. (Breathing, Heart Beat, Hormone secretion…) Sympathetic and Parasympathetic nervous systems work in opposition , if one increases actions the other deceases. 1. Ex: Fight or Flight: The Sympathetic increases heart rate, blood pressure, and cardiac output in preparing the body for emergency response. The Parasympathetic decreases heart rate, characterized as “rest and digest”. c. Sensory Neurons: are Afferent send information to the CNS. d. Interneurons: Connect neurons within the CNS. e. Efferent (motor neurons): carry a message to a muscle, gland, or other effector.
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f. Cells of Nervous System : i. Neurons : Excitable cells ii. Glial Cells : Support, help but do not conduct electrical activity. Oligodendroctes and Schwann cells. Glial: Neuron 10:1
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This note was uploaded on 11/18/2009 for the course LS 252006217 taught by Professor Esdin during the Spring '09 term at UCLA.

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LS 2 Review Central Nervous System - LS 2 Review Central...

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