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are distinguished into, 1. The anterior or middle sacral, Median Artery of the Sacrum of Chaussier, which arises from the posterior part of the abdominal aorta, in front of the 4th lumbar vertebra. It descends, in a serpentine manner, upon the sacro-vertebral articulation, and on the anterior surface of the sacrum. It furnishes many lateral branches, which unite with the lateral sacral arteries, and enter the anterior sacral foramina, to be distributed to the membranes of the marrow, etc. 2. The lateral sacral arteries, which are two in number; one on each side.' They arise from the hypogastric, from the ilio-lumbar, or from the gluteal; and descend before the anterior sacral foramina, anastomosing In an arched manner, towards the coccyx, with the middle sacral. They give off external and posterior branches, which enter the sacral foramina; and internal branches, which are distributed to the pyramidalis, sacrum, etc.