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anatomy chapter 8

TermDefinition
5 essential parts of reflex arc RECEPTORS-detect a change and generate impulses SENSORY NEURONS-transmit impulses from receptors to the CNS CENTRAL NERVOUS CENTER-contain one or more synapse MOTOR NEURONS-transmit impulses from the CNS to the effectors EFFECTORS-perform its characte
arachnoid membrane middle layer
ascending tracts carry sensory impulses to the brain
autonomic nervous system part of the peripheral nervous system(PNS)
axon carries impulses away from the cell body
central nervous system consists of the brain and spinal cord
cerebellum coordination
cerebrospinal fluid the fluid in and around the brain and spinal cord
cerebrum largest part of the brain
cranial nerves 12 pairs of nerves that emerge from the brainstem
dendrites bring impulses toward the cell body
descending tracts carry nerve impulses away from the brain
dura mater tough outer layer
fight or flight response vasoconstriction shunts blood to more vital organs such as the heart, muscles,brain
frontal lobe motor area
hypothalamus ADH
medulla vital signs
meninges connective tissue membranes that cover the brain and spinal cord made up by three layers
mixed nerves contains both sensory and motor areas
motor nerves carry messages away from the brain and spinal cord to muscles and organs
motor neurons carry impulses from the central nervous system to effectors
myelin sheath membrane surrounding the neurons that electrically insulates neurons from one another
nerve impulse electrical impulses enables the nervous system to communicate very rapidly with all parts of the body, making this system an important regulatory system
nerve tract group of axons bundled together
neurons or nerve fibers nerve cells
neurotransmitter chemicals that help the impulse travel across the synapse
occipital lobes visual
parasympathetic division dominates in relaxed or non-stress situation to promote normal functioning
parietal lobes interpret cutaneous; taste areas
peripheral nervous system consist of cranial and spinal nerves
pia mater inner layer; very thin membrane
reflex involuntary response to a stimulus, that is an automatic action stimulated by a specific change of some kind
sensory nerves the nerve that carry sensations of touch, taste, heat, cold, pain, and other modalities from the body to the central nervous system
sensory neurons carry impulses from receptors to the central nervous system
spinal cord transmit impulses to and from the brain and is the integrating center for the spinal cord reflexes
spinal cord reflex does not depend directly on the brain
spinal nerves 31 pairs of nerves that emerge from the spinal cord
sympathetic division dominates during stressful situations including anger, fear, or anxiety
synapse small gap or space between the axon of one neuron and the dendrites or cell body of the next neuron
temporal lobes hearing
thalamus sensations
ventricles four cavities within the brain that are filled with cerebrospinal fluid (CSF)
Created by: Brinab9