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nervous system AP

chapter 8&9 Memmler's

Divisions of Nervous System CNS, PNS
The CNS contains what brain and spinal cord
The PNS contains what cranial nerves and spinal nerves
the PNS is subdivided into Somatic and Autonomic nervous systems
Nervous system maintenance of homeostasis through stimuli
Somatic Nervous System SNS voluntary; Effectors: Skeletal Muscles Regulates muscle
Autonomic Nervous System ANS Involuntary; Effectors: Smooth muscle, Cardiac muscle, and glands (organs) "Visceral Nervous System" Regulates organs, heart, glands
Subdivisions of ANS Parasympathetic and sympathetic
Sympathetic enables response to stress "fight or flight" Emergency situation Adregenic
parasympathetic steady pace, "rest & digest" Functions most time cholinergic
neuron basic unit, function cell has a cell body. Nucelous
dendrites fiber, carried towards cell
axon fiber, carried away from cell
myelin fatty material insulates and protects "white matter"
PNS cells Schwann cells
Schwann cells produce myelin
node speeds up conduction of impulses; gap
neurelimmma outermost covering aids in repair of PNS
White matter vs. Gray matter white matter- myelinated gray matter- non-myelineated, all neuron bodies
3 function of neuron sensory, motor, and internerons
Sensory Afferent, conduct impulses toward CNS
motor Efferent, conduct impulses away from CNS and glands, Exit
interneurons central, relay info from within CNS
Nerve bundle of fibers in PNS
Tract bundle of fibers in CNS
mixed nerves PNS, most cranial, all spinal, both motor and sensory
neuroglia type of cell, "helper cell". connective tissue protects and nourishes nervous tissue, supports and binds to other sturctures, aid in repair of cells, acts as phagocytes to remove pathogens and impurities, regulate compostion of fluids
impulse stimulus, nerve impulse, membrane impulse
synapse point of junction between axon and dendrite
Neurotransmitters parasympathetic- ACH sympathetic- adrenaline, nonadrenaline
polarized/ polarization at rest, waiting
depolarized/ depolarization responding
repolarized/ repolarizatoin recovering
Created by: 100000743920918