12NeuralTissue2perPage (1).pdf - Chapter 12 topics \u2022 Organization of Nervous system \u2022 Neural tissue \u2013 Histology \u2013 Function Anatomical Divisions

12NeuralTissue2perPage (1).pdf - Chapter 12 topics u2022...

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4/25/19 1 Chapter 12 topics Organization of Nervous system Neural tissue – Histology – Function Anatomical Divisions of the Nervous System Central Nervous System (CNS) – Brain Spinal cord Peripheral Nervous System (PNS) Nerves (peripheral nerves)
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4/25/19 2 Overview of Nervous System Functional Divisions of the Nervous System Efferent (motor) division Relays incoming information Information flows from receptors (many types and locations) Located in organs and tissues to sensory neurons to CNS Afferent (sensory) division Relays outgoing information Information flows from the CNS to motor neurons to effectors Skeletal muscle and others
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4/25/19 3 Subdivisions of efferent (motor) division Somatic nervous system (SNS) Motor output to Somatic effectors Skeletal m uscle Autonomic Nervous System (ANS) Motor output to Visceral effectors Sm ooth m uscle Cardiac m uscle Glands (exocrine) Adipose tissue Neural Tissue Neurons, supporting cells, and their functions
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4/25/19 4 Neurons Major functional cell of nervous system Vary in form vary in location Amitotic…lack centrioles Neuron Structure Axon collaterals Axoplasmic transport: anterograde & retrograde
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4/25/19 5 Structural Classification of Neurons Anaxonic - brain, sense organs, poorly understood Bipolar - sensory - eye, ear, nasal mucosa Unipolar - sensory - PNS Multipolar - interneurons and motor neurons Functional Classification of Neurons 1- Sensory 2- Motor 3- Interneurons
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4/25/19 6 Sensory neurons two types somatic sensory visceral sensory Begin at a receptor and end in CNS Receptors monitor changes Exteroreceptors: outside body Interoceptors: internal environment Proprioceptors: body position Motor neurons two types somatic motor visceral motor Begin in the CNS end at effectors Effectors What are the five effectors?
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4/25/19 7 Interneurons also called association neurons mostly in CNS situated between sensory and motor neurons roles include Reflex mediation, Cognitive functions memory, planning, learning, etc. Neuroglia Cells that Support neurons Protect neurons
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4/25/19 8 Ependymal cells Line CNS spaces Central canal of spinal cord Ventricles in brain 3 functions: secrete cerebrospinal fluid (CSF) in ventricles monitor CSF composition circulate CSF ciliated in ventricles Astrocytes maintain blood-brain barrier provide framework for CNS repair damaged neural tissue – stabilize area regulate interstitial fluid concentrations of nutrients Ions: Na, K respiratory gases (O2, CO2) ) regulate blood flow in CNS capillaries enhance synaptic function absorb and recycle neurotransmitters may form scar tissue following CNS injury
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4/25/19 9 Microglia form from blood stem cells that give
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  • Spring '18
  • Mark Bolke

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