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14 Cards in this Set
- Front
- Back
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What are the menengial layers of the brain called?
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Dura Matter> 2 layers: periosteal layer and maningeal layer
arachnoid layer=>subarachniod space w/ arachnoid trabecular pia mater> adheres tightly to the surface of the brain |
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What is the Falx Cerebri and what is it anchored to?
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FC> the folds of the mengies that fold down in to the central longitudinal fissure (dura inner, arachnoid, pia mater)
It attaches to christa galli and to the ridges in the posterior cranial fossa |
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What is the Tentorim Cerebelli and what is it anchored to?
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The portion of the mengies that go into the transverse fissure (b/w cerebellum and occipital lobe)
Anchors to the petrius portion of the temporal bone |
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Neural Cells
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Basic anantomical and functional unit of the brain and spinal cord
2 types: Neurons, neurogilial cells |
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Neurons
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Neural cell that has a particular structure and participates in transmitting impulses
NOT A NERVE!! |
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Cell body of a neuron
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Has a membrane skin with a nucleus and cytoplasm.
Nucleus> has DNA and controls cell activity Nucleosis> has RNA for protien production Cytoplasm> made of protien and H2O..supports cell growth and maintains viablility. |
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Axon
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Nerve fibers that carry impulse away from the cell body.
Project off cell body at axon hillock Has telodendria (terminal branches) that extend w/ butons on the end to aid in synaptic fire |
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Myelin Sheath
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Spiral fatty substance that surrounds axons
naked cells: no myelin (cerebral cortex) |
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Dendrites
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Carry impulses toward the cell body
increase surface area of the cell dendritic spikes: recieve synaptic imput |
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Neuroglial
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Supports and prtects neural cells (don't transmit info)
4 types: astrocytes, digodendrocytes, microglial, appendimal |
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Astrocytes
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predominant in subcortical white matter
Fill in space b/w neurons and white matter regulate chemical compostion and metabolism gravitate toward trama areas |
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Algodendricytes
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(Digodendrocytes) Help maintain/form central nervous system myelin sheaths
1:25 (1algo for every 25 cells that need myelin) |
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Microglial
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1)phagocytes(eat dead cells)
2) support/ skeletal framework of CNS |
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Appendimal
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lines cavities of ventricular system
Helps direct cell migration in fetal development of the brain |
