When we're evaluating
and looking for blood clots
in this arterial supply,
we ask a series of questions,
2, 3 or sometimes 4 questions
to sort through what's
going on with the patient.
These are clinical
questions that we ask
the first thing when we're
evaluating a stroke patient.
And the first question
that I ask is,
Is this an anterior
or posterior circulation stroke?
When we're thinking about anterior
circulation strokes, as you see here,
we're thinking about strokes that
occur in certain vascular territories.
Anterior circulation strokes will affect
the ACA the (anterior cerebral artery),
the MCA (middle
and that ACA-MCA (Watershed),
the connection in between those.
We also see anterior circulation
supplied blood supply
to the subcortical
structures, basal ganglia,
and the capsular region where
there are motor fibers descending
to the rest of the body.
If we take a closer look
at anterior circulation,
this is the anterior
The middle cerebral artery is
going to provide blood flow
to the temporal lobes,
the frontal and parietal lobes.
The anterior cerebral artery is going
to course along the parasagittal region,
the middle aspect
of the frontal lobe.
From a posterior
there are different arteries that are
affected by posterior circulation strokes.
The PCA which provides blood flow to the
occipital regions and supports vision.
The PCA-MCA (Watershed) which is
important for watershed ischemia.
The brainstem cerebellum and then
the dominant area of the thalamus.
And here we can see in a closer
appearance that posterior circulation
and can understand that blockages
in the posterior circulation
will affect the brainstem,
the cerebellum and the
depending on which
artery is affected.