Anatomy 10/13
Terms
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- What ar eassociation tracts?
- -they connect one part of a hemisphere to another part of the same hemisphere
- What are commissural tracts?
- -connect one hemisphere to the other
- What are projection tracts?
- -connects upper and lower parts of brain
- What is decussation and where is it located?
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-crossing over of nerve fibers from one side of body to opposite
-in medulla - What are the pons and medulla?
- -relay center for incoming and outgoing impulses.
- What does the primary somatosensory cortex do, located, and what important aspects does it include?
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-receives sensory impulses from entire body
-usues post-central gyrus in parietal lobe
-first 40% includes the head
-the lips is the most sensitive part of body
-trunk has small portion of brain - Where is the primary motor cortex located and what does it include?
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-uses pre-central gyrus in frontal lobe
-first 60% is head and hands
-genitals have no motor area (controlled by blood) - What does the meningres do and where is it located?
- -protects the brain and under bone
- What is duramater and its location?
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-2 layers of dense irregular connective tissue (meningeal and periostal layers)
-on top of head which separates to form dural sinus - Where is the arachnoid located and what does it contain?
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-internal in duramater
-contains sub arachnoid space which is filled with CSF - What is the pia mater and where is it located?
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-highly vascular
-inferior to arachnoid - What is the subdural space?
- -potential space that only exists in a diseased or dead brain
- What is the falx cerebri?
- -longitudinal fissure from menigis in cerebrum
- What is the falx cerebelli?
- -fissure from menigis in cerebellum
- What does the arachnoid villi do?
- -goes into blood to take nutrients into brain and remove waste from CSF
- What are the 4 ventricles and how are they connected?
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-2 lateral ventricles ---->connected to
-third ventricle ---by interventricular foramen
-fourth ventricle- runs down spinal cord and connected to third ventricle by mesencephalic aqueduct - What are ventricles?
- -hollow spaces in brain filled with CSF
- Where is CSF produced?
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-produced in choroid plexus (in corpus callosum)
-materials retreved from blood and taken in by epidymal cells - What is the flow of CSF?
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-enters thrid ventricle from choroid plexus
-goes down aqueduct to fourth ventricle
-goes through aperture to subarachnoid space and circulated around brain and spinal cord
-then flows into dural sinus - What is the function of CSF?
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-to cushon brain and reduce impace (shock absorber)
-removes metabolic waste by transferring to blood
-gets nutrients from blood - What is meningitis?
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-inflammation of meninges
-can be either viral or bacterial - How does a virus cause meningitis?
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-a given virus has a primary target tissue
-seeks out certain tissues
-once in cell, it forces cell to replicate virus - How does a bacteria cause meningitis?
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-produces toxins
-bacterial metabolic waste toxic to certain cells - What is the end result of meningitis?
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-causes cell death
-death of menigeal cells weakens BBB
-inflamitory response triggers swelling inward
-can be fatal