Abstract
The posterior communicating artery (PCoA) arises from the cerebral part of the internal carotid artery and reaching the interpeduncular cistern unites with the posterior cerebral artery, marking the beginning of its post-communicating part. We accidentally found a case of an unusual origin and termination of the right PCoA associated with a presence of the right olfactory artery remnant in a 35-year-old male cadaver routinely dis-sected at Institute of Forensic Medicine. Presented vascular variations have not been reported previously in the literature. In the event of PCoA origin from the right middle cerebral artery normally developed from the cra-nial end of primitive internal carotid artery, as well as the PCoA junction with basilar tip, this PCoA could be the most cranial carotid-basilar anastomosis. Simultaneously, here presented right olfactory artery remnant could be the third variant of this persistent embryonic artery.
Highlights
The early brain vesicles in the human embryo are supplied by paired primitive internal carotid arteries (ICAs)
We accidentally found a case of an unusual origin and termination of the right posterior communicating artery (PCoA) associated with a presence of the right olfactory artery remnant in a 35-year-old male cadaver routinely dissected at Institute of Forensic Medicine
In the event of PCoA origin from the right middle cerebral artery normally developed from the cranial end of primitive internal carotid artery, as well as the PCoA junction with basilar tip, this PCoA could be the most cranial carotidbasilar anastomosis
Summary
The early brain vesicles in the human embryo are supplied by paired primitive internal carotid arteries (ICAs). At about 4-mm stage, ICAs divide into cranial and caudal branches at the level of optic vesicles. The caudal branches give off the diencephalic, mesencephalic and posterior choroidal branches; they will later (5- to 6-mm stage) join with paired longitudinal neural plexus, which independently developed on the ventral side of the hindbrain. Each of longitudinal neural plexus at this stage is supplied by some transitory vascular channels, i.e. cranially by the primitive trigeminal, caudally by the primitive proatlantal intersegmental, and laterally by the primitive otic and primitive hypoglossal arteries. The caudal branch becomes the posterior cerebral artery (PCA), its proximal segment becoming later the posterior communicating artery (PCoA) [1]. The aim of this report was to show unusual origin and termination of the PCoA associated with other vascular variants
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