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6 - Spinal Cord + Nerves Grays

6 - Spinal Cord + Nerves Grays - Spinal Cord and Nerves The...

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Spinal Cord and Nerves
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The Nervous System Coordinates the activity of muscles, organs, senses, and actions Made up of nervous tissue Has 3 main functions: 1. Receives sensory Input 2. Integration 3. Dictates motor output http://www.nationmaster.com/wikimir/images/upload.wikimedia.org/wikipedia/en/f/f0/ReflexArc1.jpg
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Structural Divisions of the Nervous System Central Nervous System (CNS) Brain and spinal cord Interprets incoming sensory signals Dictates motor responses Peripheral Nervous System (PNS) Nerves Cranial nerves and spinal nerves Nerve plexuses Enteric system Communication between regions of body and CNS pg 34
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Review of Nervous Tissue Features of Nervous Tissue Neuron Cell body Dendrite Axon Myelin Sheath Surrounds thicker axons Forms insulating layer Prevents leakage of electrical current Speeds up the impulse conduction www.morphonix.com
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Review of Nervous Tissue Neuroglia Reflex Arc Interneurons Rapid, automatic motor response Synapse Action potential
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Organization of a Nerve Endoneurium Surrounds each axon (nerve fiber) Myelinated and Unmyelinated axons Motor and Sensory nerve fibers Loose CT Perineurium Bundles axons into fascicles CT Epineurium Bundles fascicles into a nerve Fibrous CT CT layers contain blood vessels www.web-books.com
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Types of Nerve Signals/Fibers Sensory (afferent) Picked up by sensory receptors thru body Carried by nerve fibers of PNS into CNS Motor (efferent) Carried away from the CNS by nerve fibers into PNS Innervate muscles and glands Causes these organs to contract or secrete Remember: SA ME
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Sensory and Motor Signals/Fibers Somatic sensory Body senses touch, pressure, temperature, vibration of body, muscles stretching, balance Visceral sensory Organ senses Stretch, pain, temperature in organs (eg) nausea, hunger, cramps Somatic motor Body movement Voluntary contraction of skeletal muscles Visceral motor Organ movement Contraction of smooth muscle, glands = Autonomic Nervous System (involuntary)
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CNS Brain Spinal cord PNS Cranial nerves and spinal nerves Sensory (afferent) division Motor (efferent) division Somatic sensory General : Touch, pain, pressure, vibration Special : hearing, equilibrium, vision, smell Visceral sensory General : Stretch, pain, temperature, nausea, hunger Special : Taste Somatic motor General : Motor innervation of all skeletal muscles Visceral motor General : Motor innervation of smooth muscle, cardiac muscle, and glands; = ANS Parasympathetic division Sympathetic division
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CNS – Spinal Cord
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