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tracts
white matter of the CNS contains bundles of axons that share common origins, destinations, & functions
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white matter of the CNS contains bundles of axons that share common origins, destinations, & functions
tracts
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columns
larger groups of tracts formed in the spinal chord
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larger groups of tracts formed in the spinal chord
columns
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nerves
axons bundled together in white matter of the PNS
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axons bundled together in white matter of the PNS
nerves
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center
collection of neuron cell bodies w/ a common function
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collection of neuron cell bodies w/ a common function
center
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neural cortex
thick layer of gray matter that covers portions of the brains
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thick layer of gray matter that covers portions of the brains
neural cortex
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pathways
link the centers of the brain w/ the rest of the body
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link the centers of the brain w/ the rest of the body
pathways
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meninges
3 layers of specialized membranes that surround the brain & spinal cord, provide physical stability & shock absorbtion to CNS tissue
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3 layers of specialized membranes that surround the brain & spinal cord, provide physical stability & shock absorbtion to CNS tissue
meninges
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layers of meningeal
- 1) dura matter
- 2) arachnoid
- 3) pia matter
- (DAP)
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1) dura matter2) arachnoid3) pia matter (DAP)
layers of meningeal
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dura folds
- a) inner layer of dura mater that extends deep into the cranial cavity
- b) acts like seat belts to hold brain in position
- c) large collecting veins (dural sinuses) lie between 2 layers of dura fold
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a) inner layer of dura mater that extends deep into the cranial cavityb) acts like seat belts to hold brain in positionc) large collecting veins (dural sinuses) lie between 2 layers of dura fold
dura fold
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epidural space
between dura mater of spinal cord & walls of the vertebral canal
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between dura mater of spinal cord & walls of the vertebral canal
epidural space
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arachnoid
- a) narrow subdural space separates the inner surface of the dura mater from the 2nd meningeal layer
- b) contains small quantity of lymphatic fluid, wh/ reduces friction between the opposing surfaces
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a) narrow subdural space separates the inner surface of the dura mater from the 2nd meningeal layerb) contains small quantity of lymphatic fluid, wh/ reduces friction between the opposing surfaces
arachnoid
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dorsal root ganglia
- a) contain the cell bodies of sensory neurons
- b) every spinal segment is associated with a pair of dorsal root ganglia
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dorsal roots
bring sensory info to the spinal cord
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bring sensory info to the spinal cord
dorsal roots
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ventral roots
contains axons of CNS motor neurons that control muscles & glands
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contains axons of CNS motor neurons that control muscles & glands
ventral roots
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autonomic nervous system (ANS)
- coordinates functions...
- 1) cardiovascular
- 2) respiratory
- 3) digestive
- 4) excretory
- 5) reproductive
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coordinates functions... 1) cardiovascular 2) respiratory 3) digestive 4) excretory 5) reproductive
autonomic nervous system (ANS)
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preganglionic neurons
ANS motor neurons in the CNS
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ANS motor neurons in the CNS
preganglionic neurons
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preganglionic fibers
axons of preganglionic neurons
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axons of preganglionic neurons
preganglionic fibers
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what do ANS motor neurons (preganglionic neurons) do?
send their axons (preganglionic fibers) to autonomic ganglia outside the CNS.
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send their axons (preganglionic fibers) to autonomic ganglia outside the CNS.
what do ANS motor neurons (preganglionic neurons) do?
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where do ANS motor neurons (preganglionic neurons) synapse?
on ganglionic neurons.
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on ganglionic neurons.
where do ANS motor neurons (preganglionic neurons) synapse?
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ANS axons (postganglionic fibers) outside of the CNS
leave the ganglia & innervate cardiac muscle, smooth muscles, glands, & fat cesll.
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leave the ganglia & innervate cardiac muscle, smooth muscles, glands, & fat cesll.
ANS axons (postganglionic fibers) outside of the CNS
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preganglionic fibers from the thoracic & lumbar segment form...
sympathetic devision ("fight or flight") of ANS.
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preganglionic fibers leaving the brain & sacral segments form...
the parasympathetic division ("rest & repose" or "rest & digest" system).
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