Chapter 9~Nervous System

23 terms by KayceeLynn

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action potential

sequence electrical changes when a nerve cell membrane is exposed to a stimulus that exceeds its threshold

autonomic nervous system

portion of nervous system that controls actions of viscera and skin

axon

nerve fiber that conducts nerve impulse away from neuron cell body

central nervous system (CNS)

portion of nervous system that consists of the brain and spinal cord

convergence

nerve impulses arriving at the same neuron

dendrite

nerve fiber that transmits impulses impulses toward neuron cell body

divergence

a neuron sending impulses to multiple other neurons

effector

muscle or gland that responds to stimulation

facilitation

subthreshold stimulation of a neuron that makes it more responsive to further stimulation

ganglion

mass of neuron cell bodies, usually outside central nervous system

meningers

three membranes that cover the brain and spinal cord

myelin

fatty material that forms sheathlike coverings around some nerve fibers

neurilemma

sheath formed from Schwann cells on outside of some nerve cells

neurotransmitter

chemical that axon ends secrets to control another neuron or an effector

nissl body

rough membraneous sacs aka: chromatophilic substance

parasympathetic nervous system

portion of autonomic nervous system that arises from brrain and sacral reigons of spinal cord

peripheral nervous system (PNS)

portions of nervous system outside central nervous system

plexus

network of interlaced nerves or blood vessels

reflex

rapid automatic response to a stimulus

sensory receptor

specialized structure associated with the peripheral end of a sensory neuron specific to detecting a particualr sensation and triggering a nerve impulse in response

somatic nervous system

motor pathways of peripheral nervous system that lead to skeletal muscles

sympathetic nervous system

portion of autonomic nervous system that arisees from thoracic and lumbar reigons of spinal cord

synapse

junction between axon of one neuron and dendrite or cell body of another neuron

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