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25 Cards in this Set
- Front
- Back
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What are meninges? And name each |
Membranes that line external to the organs of the central nervous system, they protect the cns - dura mater - arachnoid Mater - Pia Mater |
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Dura mater |
Limits excessive movement of brain within cranium |
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Pia Mater |
Clings tightly to brain following its every movement(convolution) Contains blood vessels |
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Which of the meninges contains blood vessels? |
Pia Mater and arachnoid Mater |
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What are commissures? |
Connect corresponding gray areas of the two hemispheres of the brain, which allows them to coordinate and function as a whole |
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Corpus callosum |
Largest commissure |
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Anterior and posterior commisures |
Least prominent |
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What is contained within the subarachnoid space |
Filled with cerebrospinal fluid and has the largest blood vessel serving the brain |
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What is contained within the ventricles |
Cerebral spinal fluid |
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What is the composition of cerebrospinal fluid and what is its function? |
Watery broth similar to blood plasma but with less protein liquid cushion reduces brain weight by 97% and prevent brain from crushing Protects brain and spinal cord from trauma Helps nourish brain |
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What is a ganglion |
Group of neuronal cell bodies in the pns |
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What is the dorsal root ganglion |
Groups of neuronal cell bodies in the posterior side of the spinal nerve |
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What type of neurons are found in the dorsal root ganglion? why? |
Sensory neurons since the sensory fibers always come from the back of the spinal cord |
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What is a mixed nerve? |
Nerves that contain both sensory and motor fibers (or afferent and efferent axons) These nerves transmit impulses both to and from the central nervous system |
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Which of the cranial nerves are mixed? |
All except optic and olfactory |
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Do cranial nerves have dorsal and ventral roots and why? |
Yes they do because dorsal roots of the cranial nerves contain ganglia and motor fibers while the ventral root contains sensory fibers |
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What nerves have dorsal and ventral roots? |
Both cranial and spinal nerves |
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Why is there a difference between dorsal and ventral roots? |
They are different because each perform a different task pertaining to the type of neuron it carries |
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Dorsal roots |
Allow Sensory neurons to enter the spinal cord They go up towards the brain (cns) and into gray matter Also contain dorsal root ganglion or spinal ganglion that have cell bodies |
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Ventral root |
Allow motor neurons to exit spinal cord; carry info/ impulse away from CNS |
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Arachnoid mater |
Form loose brain and spinal cord covering which contains csf and blood vessels that serve the brain |
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Ependymal |
Cell that bears cilia which helps circulate csf in central cavities of cns |
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Microglial |
Cell in cns that engulf invading microorganisms and dead neurons "Garbage collectors" |
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Atrocytes |
Cell in cns that feed neurons by extracing blood sugar from capillaries for energy |
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Neuron |
Cells in pns and cns that conduct electrical impulse along the plasma membrane Carry communicate info through nerve impulse (action potentials) Back and forth impulses to and from pns and cns |
