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Chapter 11 Notes

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BIOL 2010 Anatomy and Physiology I
Chapter 11: Nervous Tissues and The Nervous System
Outline of Notes VAP

I. Introduction and Overview (Mod 11.1) A. Function of the Nervous System: Control/Regulation; 3 parts: 1. Sensory Input (afferent): from receptors 2. Information Processing (integration): Decision making 3. Motor Output (efferent): to effectors: muscles/organs/glands B. Organization/Divisions of the Nervous System 1. Central Nervous System (CNS)
-Brain
-Spinal Cord 2. Peripheral Nervous System (PNS): Nerves a. Sensory (afferent) -somatic (general)
-special senses
-visceral
b. Motor (efferent)
-Somatic/Voluntary nervous system
-Autonomic Nervous System (ANS) (1) Sympathetic Division (2) Parasympathetic Division

II. Histology of Nervous Tissues A. Neurons (Mod 11.2) 1. Special Characteristics: -Excitable
- large, complex cells with elongate extensions
-extreme longevity, amitotic, high metabolism 2. Structures: 3 major parts: cell body, dendrites, axon
-Cell Body (soma) -Nissl bodies (rough ER) stain easily….gray matter -neurofibrils for support -found in CNS in Nuclei, in PNS in Ganglia
-Neuronal Processes -Dendrites (incoming signal) -single or multiple -short and branched -Axon (outgoing signal) only one -conducting component of neuron -also called nerve fibers (part of nerves/tracts) -rarely branches (collaterals and telodendria) -axonal terminals end in synapses
-Synapses: where one neuron ends and “talks” to another cell -release neurotransmitters (like Ach)
-synaptic cleft = space between membranes -3 types: Neuro-neuronal; Neuro-muscular; -Neuro-glandular B. Classification of Neurons (mod. 11.3) 1. By Structure a. Multipolar b. Bipolar c. Unipolar d. Anaxonic (function not understood) 2. By Function: a. Sensory/Afferent (bipolar or

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