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31 Cards in this Set

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  • Back
MCA gives rise to what vessel that has clinical importance?
Anterior chorodial artery
What clinical significance does the anterior choriodal artery have?
When a stroke occurs in this artery, a loss of Parkinsonism is seen contralaterally.
What two arteries border a cranial nerve? What cranial nerve is it?
1. Superior Cerebellar Artery and the Posterior Cerebral Artery.

2. CN III (Oculomotor)
What is the most common location of a stroke?
MCA
What is a common symptom of a MCA stroke?
Acute paralysis on one side (contralateral)
Why is the forehead not usually involved in a stroke?
The facial nucleus is bilaterally innverated.
Where does a blockage in the posterior circulation usually originate?
Vertebral arteries or subclavian arteries
What are 5 clinical presentations of posterior circulation strokes?
1. Homonomous hemianopsia
2. Dysphagia
3. Headache/vomiting
4. Split sensory defect
5. Death
Steal syndrome is caused by stenosis of what vessel? What would cause a greater degree of effect?
1. The left subclavian
2. Left vertebral dominance
What are four origins of a clot in the heart?
1. Vegetations
2. Patent foramen ovale
3. Fibrillation
4. Mural
What are the two varieties of echocardiograms and what does each see?
TTE - (non-invasive)ventricles
TEE - (invasive) - atria, valves, foramen ovale
Where do lenticulostriate arteries branch off?
MCA
The anterior 2/3 of the internal capsule controls what activity?
Motor activity
The posterior 1/3 of the internal capsule controls what activity?
sensory
Can subcortical strokes cause aphasia or loss of consciousness?
No
How are the arms and legs affected in sub-cortical strokes?
Equally
How are arms and legs affected in cortical strokes?
Arms are affected moreso than legs
What time or diagnosing technique can pick up acute ischemia?
Diffusion - Perfusion Mismatch / Diffusion Weighted Imaging
Where do watershed infarcts occur and what are they a result of?
They occur at the overlap of two larger vessels such as the ACA and MCA. They are usually caused by a drop in blood pressure. They are bilateral infacrts.
What are two causes of intraparenchymal bleeds?
Hypertenstion or amyloid plaques
Rupture of what artery can cause an epidural hematoma?
Middle meningeal atery deep to the temporal bone
On a CT scan, how will subdural bleeding present? What observation can help in the diagnosis?
Isodense - same density of the brain

Shifted brain
Where do subarachnoid hematomas usually occur?
Circle of Willis
What is a symptom of a subarachnoid hematoma? Why?
Extreme headache due to compression of nerves
How is a subarachnoid hematoma diagnosed?
Lumbar puncture
What two sinuses are related to the falx cerebri?
Superior and Inferior Sagittal Sinuses
What connects the Superior and Inferior Sagittal Sinuses?
Rectus sinus
What vein is a branch of the rectus sinus and what does it drain?
The Great Vein of Galin and it drains the cerebellum and brainstem
What vessels are associated with the confulence (4)? What do they then turn into?
Transverse, Rectus, Superior Sagittal and occipital; the transverse sinus which drains into the sigmoidal sinus
What does the sigmoidal sinus drain into?
IJV
Venous blood from the Circle of Willis drains where?
Cavernous Sinus which is also drained by the Superior and Inferior Petrosal sinuses