Variable anatomic configuration of the posterior spinal arteries in humans

Clinical Anatomy : Official Journal of the American Association of Clinical Anatomists & the British Association of Clinical Anatomists
Santiago RojasAlfonso Rodríguez-Baeza

Abstract

Posterior spinal arteries (PSAs) arise from the vertebral (VA) or posterior inferior cerebellar (PICA) artery. We identified variations in their origins and their anastomosis with the first posterior radiculomedullary branches in human spinal cords. Spinal cords from male and female cadavers (n = 30) were injected with colored latex through the vertebral, ascending cervical, costocervical trunk and segmental arteries. Specimens were fixed in formalin and the spinal arteries were dissected under a surgical microscope. PSAs arise from the PICA and from the atlantoaxial (V3) or intracranial (V4) segments of the VA. Their origins can be at V3 between the axis and the transverse processes of the atlas (V3i) or between the processes and the occipital bone (V3s). Half of our specimens exhibited a symmetrical and half an asymmetrical origin of the PSAs. A symmetrical origin from V4 was the most common configuration, identified in 30% of specimens. There was a symmetrical origin from either segment of V3 or PICA in 10%. Asymmetrical configurations were observed from V4/V3 (23.7%), V3/PICA (16.7%), V4/PICA (6.7%) and V3i/V3s (3.3%). PSAs are supplied by the posterior radiculomedullary arteries along the spinal cord. The first of these an...Continue Reading

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Citations

May 20, 2020·Clinical Anatomy : Official Journal of the American Association of Clinical Anatomists & the British Association of Clinical Anatomists·Santiago RojasAlfonso Rodríguez-Baeza
Mar 2, 2019·Child's Nervous System : ChNS : Official Journal of the International Society for Pediatric Neurosurgery·Satoshi TsutsumiYukimasa Yasumoto

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