Nervous System Flashcards
(24 cards)
Structural classification
CNS- brain and spinal cord
PNS- nerves outside brain
Functional Classification
Afferent(sensory)
Nerve fibers carry info to CNS
Efferent(motor)
Nerve fibers carry impulses away
Sensory
Afferent
Somatic sensory fibers
Impulses from skin, joints, skeletal muscles
Visceral sensory fibers
Impulses from visceral organs
Motor
Efferent
Somatic NS- voluntary
Autonomic NS- involuntary
Function of Neuroglia & what
Support
Insulate
Protect neuron
CNS cells grouped
Neurons are
Specialized nerve cells
Cell body
Control center
Dendrites
Conduct impulses toward the cell body
Axon
Conduct cells impulses away from the cell body
Nervous tissue=
Neurons
Axons end in
Axon terminals
Axon terminals
Contain vesicles with Neurotransmitters
Neurotransmitters
Chemical signals
Axon terminals separated by
Synaptic cleft
Synaptic cleft
Gap between neurons
Synapse
Junction between nerves
Myelin sheath Protects Produced Covers Increase
Tightly wrapped myelin Protects nerves fibers Produced by Schwann cells Covers axons Increase transmission rate
Nodes of Ranvier
Gaps in myelin sheath along axon
Neurilemma
Part of Schwann cell
Contains cytoplasm and nucleus
On top of myelin sheath
Neurons body location
Mostly CNS(processing)
Gray matter
Cell bodies on surface of the brain
Nuclei
Clusters of cell bodies(gray) with white matter of CNS
Ganglia
Collection of cell bodies outside of CNS
Functions
Sensory input
Integration process
Interpret sensory info
Decide if action needed
