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What is the importance of Neuroglia ?
- Structural and functional support of neurons
- Provides oxygen and nutrients to neurons
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Reflex arch;
monosynaptic
Direct communication between sensory and motor neuron
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Reflex arch;
Polysynaptic Arch
interneuron facilitates sensory-motor communication.
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Gray matter consists of
- Neuron cell bodies
- Dendrites
- Axon terminals
- Synapses
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White matter consists of
myelinated axons connecting different parts of grey matter.
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Three layer of meninges
- Dura mater
- Arachnoid
- Pia mater
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Creates cerebral spinal fluid
Choroid Plexuses (ependymal cells)
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CSF flows
- choroid plexuses
- ventricles,
- cisterns
- thecal space
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The circle of willis is
- a ring of arteries that supply the brain
- common source of strokes
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What is a tight junction
restrict passage of all but certain material through the blood brain barrier.
at interface between blood and brain, endothelial cells and astrocytes are stiched together by tight junctions
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Causes of dementia
- Alzheimers
- multi-infact dementia
- Parkinsons
- Alcohol/drug
- Misc endocrine disorders, b-12 deficiency
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importance of substiantia nigra,
- Death of dopamine secreting neurons in this area is the cause of parkinsons
- located in midbrain.
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importance of lewy bodies
- destinqushing feature in PD, Lewy bodies found in affected neurons.
- they damage mitocondria. and caus
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