Fetal posterior cerebral artery
Updates to Article Attributes
A fetal (origin of the) posterior cerebral artery is a very common variant in the posterior cerebral circulation, estimated to occur in up to 30% of individuals.
The posterior communicating artery (PCOM) is larger than the P1 segment of the posterior cerebral artery (PCA) and supplies the bulk of the blood to the PCA. If bilateral, the basilar artery is significantly smaller than normal.
The term is typically used to refer to the situation where the PCOM is larger than the P1. However, variation in usage abounds.
The P1 can be small (hypoplastic) or absent. The significance is in the stroke pattern, as the PCA is therefore part of the anterior circulation. Additionally a larger PCOM (with P1 present) allows for collateral circulation.
In casecases of non fetal-fetal PCA, the PCOM lies superomedial to the occulomotoroculomotor nerve, whereas in casecases of fetal PCA, it lies superior or superolateral to the occulomotoroculomotor nerve.
-<p>A <strong>fetal (origin </strong><strong>of the) posterior cerebral artery</strong> is a very common variant in the <a href="/articles/posterior-cerebral-circulation">posterior cerebral circulation</a>, estimated to occur in up to 30% of individuals.</p><p>The <a href="/articles/posterior-communicating-artery">posterior communicating artery (PCOM)</a> is larger than the P1 segment of the <a href="/articles/posterior-cerebral-artery">posterior cerebral artery (PCA)</a> and supplies the bulk of the blood to the PCA. If bilateral, the <a href="/articles/basilar-artery">basilar artery</a> is significantly smaller than normal. </p><p>The term is typically used to refer to the situation where the PCOM is larger than the P1. However, variation in usage abounds.</p><p>The P1 can be small (hypoplastic) or absent. The significance is in the stroke pattern, as the PCA is therefore part of the anterior circulation. Additionally a larger PCOM (with P1 present) allows for collateral circulation.</p><p>In case of non fetal PCA, the PCOM lies superomedial to the <a href="/articles/cranial-nerves">occulomotor nerve</a>, whereas in case of fetal PCA, it lies superior or superolateral to the <a href="/articles/cranial-nerves">occulomotor nerve.</a></p>- +<p>A <strong>fetal (origin </strong><strong>of the) posterior cerebral artery</strong> is a very common variant in the <a href="/articles/posterior-cerebral-circulation">posterior cerebral circulation</a>, estimated to occur in up to 30% of individuals.</p><p>The <a href="/articles/posterior-communicating-artery">posterior communicating artery (PCOM)</a> is larger than the P1 segment of the <a href="/articles/posterior-cerebral-artery">posterior cerebral artery (PCA)</a> and supplies the bulk of the blood to the PCA. If bilateral, the <a href="/articles/basilar-artery">basilar artery</a> is significantly smaller than normal. </p><p>The term is typically used to refer to the situation where the PCOM is larger than the P1. However, variation in usage abounds.</p><p>The P1 can be small (hypoplastic) or absent. The significance is in the stroke pattern, as the PCA is therefore part of the anterior circulation. Additionally a larger PCOM (with P1 present) allows for collateral circulation.</p><p>In cases of non-fetal PCA, the PCOM lies superomedial to the <a href="/articles/cranial-nerves">oculomotor nerve</a>, whereas in cases of fetal PCA, it lies superior or superolateral to the <a href="/articles/cranial-nerves">oculomotor nerve.</a></p>
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