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Erika Castro-Dominguez Period:1 Nervous System - Coggle Diagram
Erika Castro-Dominguez
Period:1
Nervous System
Major Functions
Sensory Input
Provided by sensory receptors
detect internal or external
changes
Info travels from receptors to sensory neurons
transports info into the CNS
integration
Coordination of sensory information
decision-making
processing
decision-making
motor output
Nerve impulses (CNS) are conducted along motor neurons to
effectors.
response to process
Effectors
muscles or glands that respond to decisions made in the
CNS.
Central Nervous system
Neuroglia
Microglia: small cells that function as phagocytes for bacterial cells
and cellular debris
Peripheral Nervous System
Neuron
cell body (soma)
contains major organelles
Dendrites
Conduct impulses toward the cell body.
Provide the receptive surface for communication
with other neurons
short and
branching
axon
conducts impulses away from the cell body
arises from axon hillock
1 in each neuron
axon hillock
Think and extends from cell body
Myelin Sheath
myelinated fibers
enclose large axons
nodes of Ranvier
Narrow gaps in the myelin sheath
Myelin sheath increases conduction speed of nerve impulses
Classification of neurons
Multipolar neurons
many dendrites and one axon arising from cell body
Mostly found in CNS
interneurons
and motor neurons
Bipolar neurons
2 processes
dendrite and an axon
found in eyes, nose, and ears
Unipolar neurons
1 process extending from the cell body
outside the cell body,
it splits into
2 parts that function as 1 axon
the peripheral process has dendrites
near a peripheral body part
the central process runs into the CNS
cell bodies are
found in ganglia outside the CNS (sensory neurons)
Sensory
(afferent) neurons
conduct impulses from peripheral
receptors to the CNS
usually unipolar (some bipolar)
Interneurons
(association or internuncial neurons)
multipolar neurons lying
within the CNS that form links
between other
neurons
Motor
(efferent) neurons
multipolar neurons that conduct
impulses from the CNS to peripheral effectors