This is probably not the right forum for
this question but I cannot figure out
where to post it so ya'll get to see
it..That is if anybody is looking :-)
my grandmother died from a ruputured
aneurysm, my aunt suffered a ruptured one
several years ago and my mother had one
burst a couple of months ago.
The fabulous doctors that treated her
recommeded that we all get scanned to see
if we have aneurysms.
Well, my doctor just called to say that
there are no aneurysms but guess what?
You don't have a circle of willis in fact
two of the vessels that are required to
form the circle of willis are gone.
Don't be alarmed, you're obviously getting
circulation to your brain from someplace
but because you have no circle of willis
i'd live a clean life and take care of
myself because any blockage will make you
wish you had.
arteries
front view animation
lateral view animation
midsagittal view animation
the head and brain receives its arterial
blood supply via the carotid arteries
which originate from the arch of the
aorta. At the base of the ear the carotid
artery branches into internal and external
branches. The external carotid supplies
the face, scalp, skull and meninges. An
important branch is the middle meningeal
artery. Laceration of this artery in the
temporal area may cause an epidural
hematoma.
The internal carotid artery supplies the
brain itself. It is commonly divided into
its intracranial part which consists of
the carotid siphon which traverses the
base of the skull (cranium) and its
extracranial part which branches into the
middle cerebral, anterior cerebral and
posterior cerebral arteries to form the
circle of willis.
The anterior cerebral artery supplies the
frontal lobes and medial aspects of the
parietal and occipital lobes.
The middle cerebral artery, also called
the artery of stroke, supplies the
frontoparietal somatosensory cortex.
Infarcts in its territory result in
contralateral hemiparesis.
The posterior cerebral artery supplies the
occipital and inferior temporal lobes
including the hippocampus.
The circle of willis consists of the
posterior communicating arteries and the
anterior communicating arteries. Striate
arteries also known as "penetrators"
branch from the circle of willis to supply
the basal ganglia and thalamus. These
vessels are a common source of strokes.
Both small ischemic infarcts, known
pathologically as lacunes, and major
intracerebral hemorrhages occur within the
tissue supplied by these penetrating
arteries.
The medulla is supplied by the vertebral
arteries. The anterior spinal artery
arises at the bifurcation of the
vertebrals and descends to supply the
spinal cord.
The vertebral arteries fuse at the
pontomedullary junction to form the
basilar artery. The posterior inferior
cerebellar artery arises from the caudal
aspect of the basilar artery. Penetrators
from the basilar artery supply the pons.
The superior cerebellar artery arises
superiorly from the basilar artery. The
basilar artery then bifurcates into the
posterior cerebral arteries.
Veins
large veins in the subrachnoid space empty
in the dural venous sinuses. The sagittal
sinus is located in the dura wiithin the
longitudinal fissure. The transverse
sinus is located in the dura of the caudal
tentorium. The vein of galen is a medial
and rostral extension of the transverse
sinus in the tentorium.
Last update jan 21, 2002
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timswife
New User, Becoming EHEALTHy
Joined: 16 Aug 2006 Posts: 1 Location: Tennessee
No Circle of Willis Posted: 08-16-06 08:24am
My Dr. Has just told me that I have no
circle of willis. I have been having
numbness in my face, neck and arms... I
really don't know what to expect here.
I have a follow up visit tomorrow to get
more info from my Dr. After he speaks
with a neuro surgeon.
Any information you have about this would
be appreciated.
Thanks
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