Assertion: perineum's blood supply | /r/CapableOf | pass around ischial spine
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Source sentences:
text: The blood supply to the perineal structures is derived from the branches of the internal pudendal artery, which arises from the anterior trunk of the internal iliac, leaves the pelvic cavity through the greater sciatic foramen, passes around the ischial spine, and enters the perineum by means of the lesser sciatic foramen.