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Chapter 9 HAP

chapter 9 vocab

QuestionAnswer
ax- axle
axon cylindrical nerve fiber that carries impulses away from a neuron cell body
dendr- tree
dendrite branched nerve fiber that serves as a receptor surface of a neuron
funi- small cord or fiber
funiculus major nerve tract or bundle of myelinated nerve fibers within the spinal cord
gangli- a swelling
ganglion mass of neuron cell bodies
-lemm rind or peel
neurilemma sheath that surrounds the myelin of a nerve fiber
mening- membrane
meninges membranous coverings of the brain and spinal cord
moto- moving
motor nueron neuron that stimulates a muscle to contract or a gland to secrete
peri- all around
peripheral nervous system portion of the nervous system that consists of nerves branching from the brain and spinal cord
plex- interweaving
choroid plexus mass of specialized capillaries associated with spaces in the brain.
sens- feeling
sensory neuron sensory receptor that stimulates a neuron to conduct impulses into the brain or spinal cord
syn- together
synapse junction between two neurons
ventr- belly or stomach
ventricle fluid-filled space within the brain
action potential sequence of electrical changes when a nerve cell membrane is exposed to a stimulus that exceeds its threshold
autonomic nervous system portions of nervous system that controls actions of viscera and skin
central nervous system portion of the nervous system that consists of brain and spinal cord
convergence nerve impulses arriving at the same neuron
divergence a neuron sending impulses to multiple other neurons
effector muscle or gland that responds to a stimulation
facillitation subthreshold stimulation makes it more responsive to further stimulation
myelin fatty material that forms a sheath like covering around some nerve fibers
neurotransmitter chemical that axon ends secretes to control another neuron or any effector
nissl body membranous sacs within cytoplasm of nerve cells that have ribosomes attached to their surfaces
parasympathetic nervous system portion of autonomic nervous system that arises from brain and sacral region of spinal cord
reflex rapid autonomic response to a stimulus
sensory receptor specialized structure associated with the peripheral end of a sensory neuron specific to detecting a particular sensation and triggering a nerve impulse in response, which is transmitted to the central nervous system
somatic nervous system motor pathways of peripheral nervous system that lead to the skeletal muscles
sympathetic nervous system portion of autonomic nervous system that arises from the thoracic cavity and lumbar regions of spinal cord
Created by: caitlynnham