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Henry Gray (1825–1861). Anatomy of the Human Body. 1918.

FIG. 1213

Sagittal section of vertebral canal to show the lower end of the medulla spinalis and the flum terminale. (Testut.) Li, Lv. First and fifth lumbar vertebra. S?? Second sacral vertebra. 1. Dura mater. 2. Lower part of subarachnoid cavity. 3. Lower extremity of medulla spinalis. 4. Filum terminale internum, and 5. Filum terminale externum. 6. Attachment of filum terminale to first segment of cooccyx.