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Introduction to Nervous System PowerPoint Presentation

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Description : Check out this medical presentation on Neurology, which is titled "Introduction to Nervous System", to know about the Composition of Nervous System.

Tags : Neurology, Introduction, Nervous System, Composition

Published on : Aug 29, 2021 | Views : 1000 | Downloads : 4

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Slide 1-

Introduction to Nervous System
Slide 2-

Composition of Nervous System Two main divisions 1) Central Nervous system (CNS) brain and spinal chord 2)Peripheral Nervous System (PNS) nerves
Slide 3-

Remember from Homeostasis Message is received from sensory receptor along sensory neuron (afferent pathway) Messages reaches brain and is integrated (control center) Reaction command sent down efferent pathway along motor neuron (motor output)
Slide 4-

Types of Motor Actions Somatic Happens in skeletal muscle voluntary Autonomic Happens in smooth and cardiac muscle Involuntary 2 parts Sympathetic and parasympathetic
Slide 5-

Cells of the Nervous System Broken down into two groups 1) supporting cells 2) neurons
Slide 6-

Examples of Neuroglia (supporting cells) 1) astrocytes – anchor neurons to capillaries 2) microglia – phagocytes (digest debris and dead cells) 3) Ependymal cells- ciliated; always on surface near spinal fluid; circulates fluid
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One more Neuroglial cell (in CNS) 4)Oligodendrocytes – fatty; insulated nerve fibers Produce myelin sheath which surround and insulate the nerve fiber
Slide 8-

In PNS Instead of oligodendrocytes, they have Schwann cells, which insulate the nerve fiber Satellite cells – form protective layer around nerve cell body
Slide 9-

Neurons Specifically designed to transmit message (nerve impulse)
Slide 10-

Parts of a Neuron 1)Cell Body- contains nucleus 2) fiber (process)- carries message to next neuron Toward cell body = dendrites Away from cell body = axon
Slide 11-

Axonal Terminal As an axon ends, it branches into hundreds of synapses. Releases neurotransmitters to next neuron or muscle
Slide 12-

Myelination of Neurons In CNS, the fatty covering is oligodendrocyte In PNS, fatty myelin forms Schwann cells, which increase transmission rate. Gaps between Schwann cells= Nodes of Ranvier