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109 Cards in this Set
- Front
- Back
Stroke is ____ leading cause of death in the US.
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3rd
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Risk Factors of Stroke
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Heart Disease
Diabetes Smoking Obesity Birth Control Pills Being a Male Being African American Having a family history of CVA. If you have previously suffered a stroke or TIA. |
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Heart Disease as a risk factor for stroke
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High blood pressure
coronary artery disease high cholesterol |
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Diabetes as a risk factor for stroke
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Diabetes causes high glucose levels, which results in fatty deposits on your arteries.
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Smoking as a risk factor for stroke
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reduced oxygen in blood from nicotine
high blood pressure cholesterol deposits form on artery walls from carbon monoxide |
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Obesity as a risk factor for stroke
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places strain on your heart and blood vessels
associated with high blood pressure and diabetes |
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Birth control pills as a risk factor for stroke
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increased ocurrence of blood clots
increase if over 30 yrs old increase if take BCP and smoke together |
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Rostral/Caudal
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towards head/towards tail
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ventral/dorsal
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towards front/towards back
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Frontal Lobe boundaries
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posterior: central sulcus
inferior: lateral sulcus |
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Frontal lobe makes up ____ of the surface of each hemisphere.
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1/3
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Frontal Lobe Structures of Interest
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Precentral gyrus
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Precentral Gyrus
AKA/function |
primary motor strip/Area 4
voluntary control of skeletal mms on the contralateral side |
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premotor area
AKA/function |
Area 6
planning and intitiating sequential, volitional mvmt |
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gyri/sulcus
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hills/valleys
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sagittal cut
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divides left and right
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horizontal/transverse cuts
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divides top and bottom
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coronal cut
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dives front and back
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Parietal Lobe Boundaries
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anterior- postcentral gyrus
posterior- undefined inferior- lateral sulcus |
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Postcentral gyrus
AKA/functions |
AKA primary sensory strip/1,2,3
receives sensations of touch and pressure (but not pain and temp) |
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Temporal Lobe
AKA/Functions |
perception/processing of auditory information
Left- comprehending verbal and written material, process meaning and syntax Right- processing nonverbal visual info and nonverbal sound |
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Temporal Lobe Boundaries
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superior- lateral sulcus
inferior- on underside of hemisphere posterior- undefined |
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Temporal Lobe Structures of Interest
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Superior temporal gyrus (22)
middle temporal gyrus (21) inferior temporal gyrus (20) Heschl's gyrus (41, 42) Wernicke's area (22) posterior portion of the lateral sulcus |
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Parietal Lobe Structures of Interest
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Postcentral gyrus (1, 2, 3)
supramarginal gyrus (40) angular gyrus (39) |
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Occipital Lobe
Boundaries, structures of interest |
No clear boundaries
Primary visual cortex (17) Primary visual association area (18, 19) |
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Association Cortex
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fibers that run amongst all areas within a hemisphere, they interpret information and provide meaning
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damage to association cortex but spared primary areas causes_____
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agnosia
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A large group of fibers can be a ____1___. A large ____1__ can be a __2_____.
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bundle
fascicululous |
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arcuate fasciculus
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connects wernicke's area to broca's area (does not cross lateral sulcus, arcs around) used to process and interpret information.
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damage to arcuate fasciculous
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breaks connections between broca's and wernicke's, but both work separately. will NOT be able to repeat and have difficulty monitoring speech (speech will contain paraphasic errors)
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pre-frontal area (tertiary cortex)
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involved with personality, expression of emotion, drive/ability to inhibit, helps us set goals, solve problems, plan
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lower/medial portions of temporal lobe (tertiary area)
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episodic memory, recalling words
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Commissural fiber
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corpus callosum
runs between hemispheres |
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anterior cerebral artery supplies _____
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medial surface of cortex from the frontal lobe all the way to the temporal-parietal-occipital sulcus
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if anterior cerebral artery is occluded __________results
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motor impairment, may have trouble with EF
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MCA supplies blood to _____
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entire lateral hemisphere, including all 4 lobes.
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aphasia results from damage to ____
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MCA!
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the brain is fed by two main arteries:
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common carotid and vertebral
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internal carotid forms the ___ and ____
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MCA and anterior cerebral artery
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the vertebral artery goes through the ____ and forms the _____ artery
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vertebral column, basilar artery
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the basilar artery divides into ___ and ____
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left and right posterior cerebral arteries
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ant comm artery connects the _____
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left and right ant cerebral arteries.
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the post comm artery connects the ____
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basilar/PCA juncture to the internal carotid just before it divides
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Disruption of the ant cerebral artery causes
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impaired motor strip, leading to paralysis of legs and feet, and or prefrontal areas, leading to impairments in EF
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disruption of posterior cerebral artery causes
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visual field blindness (feeds occipital lobe and inferior/lateral portions of the parietal lobe)
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watershed areas
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the ends of the ant cerebral artery, post cerebral artery, MCA connect with each other. the area in which this connection occurs is referred to as watershed area. this connections provides another source of collateral circulation where blood from one artery could flow into another if needed.
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right homonymous hemianopsia
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Since the primary visual area in one hemisphere receives sight from the opposite half visual field, damage to the left primary visual area will cause blindness in the right half of the visual field.
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motor root of spinal nerves
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aka ventral root. in anterior portion of spinal cord.
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sensory root of spinal nerves
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aka dorsal root. in posterior portion of spinal cord.
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two tracts from spinal nerves are ___ and ___
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pyramidal and extrapyramidal tracts
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primary motor strip/precentral gyrus is in charge of controlling all ______ movement on ______ side of body
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voluntary, contralateral
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_____ is origin of pyramidal tract
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precentral gyrus
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pyramidal tract course
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down brain, through internal capsule, through pons, to brainstem, connects with cranial nerves, courses down spinal column, connects with spinal nerves
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_____is where pyramidal tract synapses with ventral/motor root of spinal nerves
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final common pathway aka direct activation pathway
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__________ tract is direct pathway to initiate all skilled, voluntary movement
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pyramidal tract
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______________ is indirect activation pathway. it originates in ______
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extrapyramidal, BG
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function of extrapyramidal tract
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adjust mm tone and posture during volitional movement
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sensory info travels from post. horn of spinal cord through ____ and into post central gyrus
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thalamus
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stroke aka cva aka brain attack
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sudden onset of prominent and usually persistent neurological deficit
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warning signs of stroke
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FAST
F- droopy face a- arms drifts to ground s- slurred speech t- no time to waste |
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most common type of stroke
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ischemic (75-80%)
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what happens during ischemic stroke
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as blood flow reduces, brain does not get enough oxygen and glucose. if that continues, necrosis occurs and then an infarct
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within 24 hrs of stroke
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the brain does not respond. there is an initial onset of a stroke and sometimes the stroke continues. Stroke many continue for several hours (evolving/progressive stroke).
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3-5 days after stroke
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the brain is swelling, full of fluid in tissues, edema, will reach its maximum swelling point.
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7th day of stroke
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the swelling and edema start to diminish,
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12-21 days after stroke
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the swelling and edema should be resolved. The brain works to heal itself.
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one month after stroke
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brain starts to reabsorb dead tissue (this continues for a few months). A cavity is left (depending on how much tissue has died), and the cavity will be filled with fluid. Sometime atrophy from aging has more dramatic effect because of cavity.
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hemorrhagic stroke
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16% of strokes, Results from bleeding from an artery in the intracranial space.
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3 causes of hemorrhagic stroke
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• Rupture of a blood vessel which causes hematoma
• Rupture of aneurysm (ballooning/bulging of weakened blood vessel). • An AV Malformation (Arterial Venous Malformation), which is congenital (you may not know you have it until it bleeds. If AVM, it is very challenging to stop bleeding but allow for adequate blood flow. |
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3 ares of occurence in hemorrhagic stroke
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• Within the working part of the brain, which is deep in our cortex, The BG
• Subarachnoid space (almost always because of an aneurysm). The aneurysms are almost always at the base of the brain on the vertebral arteries. • Subdural space |
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damage from hemorrhagic stroke
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• Increased pressure to the area of the brain where the blood is flowing.
• If you can stop the bleeding and relive the pressure, function returns. You’re much more likely to die from a hemorrhagic stroke. If you survive, you have less functional impairment than if you survive an ischemic stroke. |
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TIA
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• A brief, focal, cerebral event. The symptoms develop quickly and they leave within 2 minutes-24 hours.
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symptoms of TIA
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motor dysfunction (lack of movement or weakness in limbs), sensory changes (numbness or tingling in face or extremities), gait/posture abnormalities (can’t sit straight in a chair), double vision, brief dysarthria, brief dysphagia, dizziness (but is always associated with another symptom).
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symptoms of PPA
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range of impairments in comprehension, naming, speech fluency, reading, writing
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focal neurological signs of a stroke
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• May see paralysis on one side of the body, speech production/comprehension problems, memory loss, confusion, and sensory impairment.
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why do strokes occur?
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• The blood vessels in our brain are frailer and not as thick as the rest of the blood vessels in our body. They react to differences in blood pressure, chemical changes in our blood, and they do so more quickly, react stronger than the rest of our body. It is easier for the vessels in our brain to rupture.
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CT strength/weakness
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cross-sectional images of brain taken from various angles to ID presence/location of lesion. radiation exposure. affordable but does not allow immediate visualization
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MRI strength/weakness
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Look at brain’s ability to utilize glucose for feeding nerve tissue. Examine areas that are more/less active. Very expensive, mostly used for research purposes.
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fmRI strenghts/weakness
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Show more structure than PET. Can see ventricle, have some sense of position and shape of cerebrum, the fMRI is analyzing blood flow. Look at highly oxygenated blood verses less oxygenated blood. Look at color and intensity of blood. Will be able to pinpoint area of thrombosis or hemorrhage if see area of less oxygenated blood.
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corticospinal tract (pyramidal tract)
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• Starts on primary motor strip in each hemisphere. Connects primary motor strip to spinal nerves, which travel to our limbs. Courses down through brain, at level of medulla, it decussates.
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lesion to corticospinal tract
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If you have a lesion on the corticospinal tract above the level of decussation, you are going to have contralateral weakness or paralysis. If lesion occurs below level of decussation, clinical signs will be ipsilateral.
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corticobulbar tract (pyramidal tract)
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• Starts on precentral gyrus (primary motor strip). Connects to the cranial nerves. Provides innervation to the head and neck ipsilaterally and contralaterally.
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exceptions to bilateral lesions of corticobulbar tract
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hypoglossal nerve and the facial nerve
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lesions to corticobulbar tract
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see google doc
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apraxia
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motor speech disorder/impairment in the motor programming of volitional speech movements/loss of voluntary control of speech production.
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dysarthria
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motor speech disorder/impairment in the execution of speech movement due to mm weakness, slowness, or discoordination. Dysarthric speech may sound slurred, hoarse/harsh/strained voice, decreased breath support.
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auditory agnosia
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impaired processing of all auditory information including environmental sounds (phones, baby crying, sirens)
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auditory verbal agnosia
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-(pure word deafness)- because of site of lesion, patient can’t understand language that they hear, but can talk, write, and read ok.
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visual-verbal agnosia
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(pure word blindness, pure alexia)- can’t read but can talk, listen, and write
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paraphasic errors
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patients after stroke do paraphasic errors at a pathological level. Types of errors they have helps us to know what kind of aphasia they have
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types of paraphasic errors
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verbal
semantic phonemic (literal) phonic (formal) neologisms jargon |
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verbal paraphasic errors
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unrelated real word substitution (pencil/dog)
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semantic paraphasic error
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related word substitution (cat/dog)
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phonemic (literal) paraphasic error
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sound substitution (pog/dog, spork/fork)
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phonic (formal) paraphasic error
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whole word substitution that shares phonemes with target (pickle/player)
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neologism paraphasic error
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nonwords which may or may not have a resemblance to target
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jargon paraphasic error
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most words, even function words, are replaced with non-words.
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2 controversies of aphasia
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can you classify it? is there more than 1 type?
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4 viewpoints
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general language disorder
pieces/parts language disorder impaired access psycholinguistic/cognitive |
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general language disorder (viewpoint)
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• A language impairment in all areas (even reading, writing, speaking, listening)
• No other impairment. Aphasia is a pure language impairment. • If a patient had difficulty with reading and writing could could listen and speak, they do not have aphasia. • Hildred Schuell and Fred Darly associated with this viewpoint. |
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pieces/parts viewpoint
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• From Boston School, Goodglass and Kaplin (authors of Boston Diagnostic Aphasia Examination and Western Battery are based on this viewpoint).
• Is a wildly popular viewpoint. • Various modalities of language can be selectively impaired and called aphasia. If you know the clinical area that is impaired, you can make a hypothesis to what area of the brain is damaged. Relationship between anatomical site of lesion and clinical function. (Remember aphasia must be from a CVA) |
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impaired access viewpoint
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• Doctor McNeil- University of Pennsylvania
• Not widely accepted • Language is not primary impairment. What’s impaired is patient’s ability to access it. Physiologically, their brain is not allowing them to get to language stored in the brain because of changes that have occurred from CVA. Decreased reaction time, increased sensory threshold, attention fluctuates, can’t allocate as much effort to understanding, get tired easily. Aphasia would not be addressed, changes would be addressed. |
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pyscholinguistic/cognitive viewpoint
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• Clarke and Murray, Dr. Chapey (Arizona)
• Aphasia is an acquired impairment in language and the cognitive processes that underlie it. Aphasia impacts all modalities of language and cognition (memory/attention may be impaired). |
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definition of aphasia
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• A language impairment resulting from a stroke. It is characterized by impairment in all language modalities including speaking, listening, reading, and writing but not necessarily to the same degree in each modality. Aphasia may be accompanied but not required to be accompanied by impairment in memory and higher cortical functioning.
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be able to draw pictures and label parts!
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!
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explain homonymous hemianopsia
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!
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draw circle of willis
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!
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know Brodman's areas
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!
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If a person had a lesion to the corticobulbar and corticospinal tracts of the left hemisphere the result would be:
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1. Right hemiparesis/paralysis
2. Right facial weakness 3. Deviation of the tongue (this may be transient) |