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109 Cards in this Set

  • Front
  • Back
Stroke is ____ leading cause of death in the US.
3rd
Risk Factors of Stroke
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.
Heart Disease as a risk factor for stroke
High blood pressure
coronary artery disease
high cholesterol
Diabetes as a risk factor for stroke
Diabetes causes high glucose levels, which results in fatty deposits on your arteries.
Smoking as a risk factor for stroke
reduced oxygen in blood from nicotine
high blood pressure
cholesterol deposits form on artery walls from carbon monoxide
Obesity as a risk factor for stroke
places strain on your heart and blood vessels
associated with high blood pressure and diabetes
Birth control pills as a risk factor for stroke
increased ocurrence of blood clots
increase if over 30 yrs old
increase if take BCP and smoke together
Rostral/Caudal
towards head/towards tail
ventral/dorsal
towards front/towards back
Frontal Lobe boundaries
posterior: central sulcus
inferior: lateral sulcus
Frontal lobe makes up ____ of the surface of each hemisphere.
1/3
Frontal Lobe Structures of Interest
Precentral gyrus
Precentral Gyrus
AKA/function
primary motor strip/Area 4
voluntary control of skeletal mms on the contralateral side
premotor area
AKA/function
Area 6
planning and intitiating sequential, volitional mvmt
gyri/sulcus
hills/valleys
sagittal cut
divides left and right
horizontal/transverse cuts
divides top and bottom
coronal cut
dives front and back
Parietal Lobe Boundaries
anterior- postcentral gyrus
posterior- undefined
inferior- lateral sulcus
Postcentral gyrus
AKA/functions
AKA primary sensory strip/1,2,3
receives sensations of touch and pressure (but not pain and temp)
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
Temporal Lobe Boundaries
superior- lateral sulcus
inferior- on underside of hemisphere
posterior- undefined
Temporal Lobe Structures of Interest
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
Parietal Lobe Structures of Interest
Postcentral gyrus (1, 2, 3)
supramarginal gyrus (40)
angular gyrus (39)
Occipital Lobe
Boundaries, structures of interest
No clear boundaries
Primary visual cortex (17)
Primary visual association area (18, 19)
Association Cortex
fibers that run amongst all areas within a hemisphere, they interpret information and provide meaning
damage to association cortex but spared primary areas causes_____
agnosia
A large group of fibers can be a ____1___. A large ____1__ can be a __2_____.
bundle
fascicululous
arcuate fasciculus
connects wernicke's area to broca's area (does not cross lateral sulcus, arcs around) used to process and interpret information.
damage to arcuate fasciculous
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)
pre-frontal area (tertiary cortex)
involved with personality, expression of emotion, drive/ability to inhibit, helps us set goals, solve problems, plan
lower/medial portions of temporal lobe (tertiary area)
episodic memory, recalling words
Commissural fiber
corpus callosum
runs between hemispheres
anterior cerebral artery supplies _____
medial surface of cortex from the frontal lobe all the way to the temporal-parietal-occipital sulcus
if anterior cerebral artery is occluded __________results
motor impairment, may have trouble with EF
MCA supplies blood to _____
entire lateral hemisphere, including all 4 lobes.
aphasia results from damage to ____
MCA!
the brain is fed by two main arteries:
common carotid and vertebral
internal carotid forms the ___ and ____
MCA and anterior cerebral artery
the vertebral artery goes through the ____ and forms the _____ artery
vertebral column, basilar artery
the basilar artery divides into ___ and ____
left and right posterior cerebral arteries
ant comm artery connects the _____
left and right ant cerebral arteries.
the post comm artery connects the ____
basilar/PCA juncture to the internal carotid just before it divides
Disruption of the ant cerebral artery causes
impaired motor strip, leading to paralysis of legs and feet, and or prefrontal areas, leading to impairments in EF
disruption of posterior cerebral artery causes
visual field blindness (feeds occipital lobe and inferior/lateral portions of the parietal lobe)
watershed areas
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.
right homonymous hemianopsia
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.
motor root of spinal nerves
aka ventral root. in anterior portion of spinal cord.
sensory root of spinal nerves
aka dorsal root. in posterior portion of spinal cord.
two tracts from spinal nerves are ___ and ___
pyramidal and extrapyramidal tracts
primary motor strip/precentral gyrus is in charge of controlling all ______ movement on ______ side of body
voluntary, contralateral
_____ is origin of pyramidal tract
precentral gyrus
pyramidal tract course
down brain, through internal capsule, through pons, to brainstem, connects with cranial nerves, courses down spinal column, connects with spinal nerves
_____is where pyramidal tract synapses with ventral/motor root of spinal nerves
final common pathway aka direct activation pathway
__________ tract is direct pathway to initiate all skilled, voluntary movement
pyramidal tract
______________ is indirect activation pathway. it originates in ______
extrapyramidal, BG
function of extrapyramidal tract
adjust mm tone and posture during volitional movement
sensory info travels from post. horn of spinal cord through ____ and into post central gyrus
thalamus
stroke aka cva aka brain attack
sudden onset of prominent and usually persistent neurological deficit
warning signs of stroke
FAST
F- droopy face
a- arms drifts to ground
s- slurred speech
t- no time to waste
most common type of stroke
ischemic (75-80%)
what happens during ischemic stroke
as blood flow reduces, brain does not get enough oxygen and glucose. if that continues, necrosis occurs and then an infarct
within 24 hrs of stroke
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).
3-5 days after stroke
the brain is swelling, full of fluid in tissues, edema, will reach its maximum swelling point.
7th day of stroke
the swelling and edema start to diminish,
12-21 days after stroke
the swelling and edema should be resolved. The brain works to heal itself.
one month after stroke
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.
hemorrhagic stroke
16% of strokes, Results from bleeding from an artery in the intracranial space.
3 causes of hemorrhagic stroke
• 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.
3 ares of occurence in hemorrhagic stroke
• 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
damage from hemorrhagic stroke
• 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.
TIA
• A brief, focal, cerebral event. The symptoms develop quickly and they leave within 2 minutes-24 hours.
symptoms of TIA
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).
symptoms of PPA
range of impairments in comprehension, naming, speech fluency, reading, writing
focal neurological signs of a stroke
• May see paralysis on one side of the body, speech production/comprehension problems, memory loss, confusion, and sensory impairment.
why do strokes occur?
• 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.
CT strength/weakness
cross-sectional images of brain taken from various angles to ID presence/location of lesion. radiation exposure. affordable but does not allow immediate visualization
MRI strength/weakness
 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.
fmRI strenghts/weakness
 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.
corticospinal tract (pyramidal tract)
• 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.
lesion to corticospinal tract
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.
corticobulbar tract (pyramidal tract)
• Starts on precentral gyrus (primary motor strip). Connects to the cranial nerves. Provides innervation to the head and neck ipsilaterally and contralaterally.
exceptions to bilateral lesions of corticobulbar tract
hypoglossal nerve and the facial nerve
lesions to corticobulbar tract
see google doc
apraxia
motor speech disorder/impairment in the motor programming of volitional speech movements/loss of voluntary control of speech production.
dysarthria
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.
auditory agnosia
impaired processing of all auditory information including environmental sounds (phones, baby crying, sirens)
auditory verbal agnosia
-(pure word deafness)- because of site of lesion, patient can’t understand language that they hear, but can talk, write, and read ok.
visual-verbal agnosia
(pure word blindness, pure alexia)- can’t read but can talk, listen, and write
paraphasic errors
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
types of paraphasic errors
verbal
semantic
phonemic (literal)
phonic (formal)
neologisms
jargon
verbal paraphasic errors
unrelated real word substitution (pencil/dog)
semantic paraphasic error
related word substitution (cat/dog)
phonemic (literal) paraphasic error
sound substitution (pog/dog, spork/fork)
phonic (formal) paraphasic error
whole word substitution that shares phonemes with target (pickle/player)
neologism paraphasic error
nonwords which may or may not have a resemblance to target
jargon paraphasic error
most words, even function words, are replaced with non-words.
2 controversies of aphasia
can you classify it? is there more than 1 type?
4 viewpoints
general language disorder
pieces/parts language disorder
impaired access
psycholinguistic/cognitive
general language disorder (viewpoint)
• 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.
pieces/parts viewpoint
• 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)
impaired access viewpoint
• 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.
pyscholinguistic/cognitive viewpoint
• 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).
definition of aphasia
• 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.
be able to draw pictures and label parts!
!
explain homonymous hemianopsia
!
draw circle of willis
!
know Brodman's areas
!
If a person had a lesion to the corticobulbar and corticospinal tracts of the left hemisphere the result would be:
1. Right hemiparesis/paralysis
2. Right facial weakness
3. Deviation of the tongue (this may be transient)