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Nervous System (Gen)

General nervous system info

Two main divsions of nervous system central, peripheral
CNS (Central Nervous System) consists of the brain and spinal cord
Peripheral nervous system nerves tissues in the periphery or outer region of the nervous system
Somatic Nervous Systen motor neurons that control voluntary actions of skeletal muscles
Divisions of SNS somatic sensory division (afferent), somatic motor division (efferent)
Divisions of ANS visceral sensory division (afferent), sympathetic division (efferent), parasympathetic division (efferent)
afferent division incoming sensory pathways (carry toward)
efferent division all outgoing motor pathways (carry away)
neurons nerve cell including its processes (axons and dendrites); excitable cells that conduct impulses that make possible all nervous system functions "wiring" of nervous system
Glia / neuroglia nonexcitable supporting cells of nervous tissue
Types of glia cells astrocytes, microglia, ependymal cells, ogliodendrocytes, schwann cells, satelite cells
astrocytes star shaped; help form blood brain barrier, recycle neurotransmitters
microglia macrophages that engulf microorganisms and dead neuro tissue/cellular debris
ependymal cells line cavities of brain and spinal cord; form thin sheets that line the fluid filled cavities in the brain and spinal cord
ogliodendrocytes act as insulation, help form myelin sheaths
schwann cells found only in the peripheral nervous system; wrap around axons to from myelin sheath
functional classification of neurons afferent (sensory), efferent (motor), interneurons (association)
reflex arc impulse conduction route to and from the CNS; smallest portion of the nervous system that can receive stimulus and generate a response
saltatory conduction process in which a nerve impulse travels along a myelinated fiber by jumping from one node of Ranvier to the next
classification of neurotransmitters acetylcholine, amines, amino acids, other small molecules
Created by: gdemuth