A Variant of the First Perforating Artery Passing Immediately below the Quadratus Femoris : a Case Report and a Study of the Territorial Relationship between the Perforating Artery and the Descending Branch of the Medial Circumfiexus Femoral Artery

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  • 内側大腿回旋動脈下行枝と貫通動脈の分布域に関する研究 : 第1貫通動脈が大腿方形筋の直下を通る1変異例を中心に

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The authors encountered an anatomical variant in which the first perforating artery （FPA） emerged posteriorly immediately below the quadratus femoris muscle. Although the usual medial circumflexus/circumflex femoral artery （MCFA） was coexistent, the variant suggested an intermediate morphology between the FPA and the usual descending branch of the MCFA. Using the observations from 51 lower extremities, we examined configurations of these arteries with special reference to the territorial correlation, i. e., whether the descending branch of the MCFA shows complementary territorial relations with the FPA and, if so, whether there is an intermediate morphology between these two arteries. The MCFA consistently supplied a limited area of the posterior thigh, whereas the FPA varied independently in its territory but consistently was the most dominant of all arteries supplying the region. Consequently, the variant might occur as a result of a muscular variation, and the suggested intermediate morphology was not evident.

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