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of the anterior perforated substance.
Arteries of the anterior perforated substance (APS) are important because of their role in blood supply of the important structures such as the internal capsule, putamen, and caudate nucleus. The purpose of this study was to investigate the arteries of the APS. The arteries of the APS were investigated in 60 cerebral hemispheres from 30 formalin fixed adult cadaveric brains. The dissections were performed using microsurgical instruments and a surgical microscope. The numbers and the origins of the arteries of the APS were investigated. The branches of the middle cerebral artery (MCA) which penetrated the APS are known as the lateral lenticulostriate arteries (LLAs). The average number of LLAs arose from the M1 segment of the MCA was found seven (min: 4, max: 11) in all specimens. The branches of the anterior choroidal artery which reached the APS were seen in all specimens. We found one to three branches which arose from A2 segment of anterior cerebral artery (ACA) to APS in all hemispheres. And also, one to three branches originated from A1 segment of ACA were seen in 48 hemispheres. In addition, two accessory MCAs (accMCA) originated from the A2 segment of the ACA were recorded as a variation and their perforating branches to APS were observed. Some complications like motor deficits can occur due to the injuries of these arteries. Therefore, the neurosurgeons must be aware during operations such as aneurysm or insular tumor surgeries.
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