Gray 661 - Drawing. Public domain image.

Gray's Anatomy is a classic human anatomy textbook first published in 1858 by Henry Gray. The book, which is widely considered to be one of the most important and influential works in the field of anatomy, provides a detailed and comprehensive description of the human body, including the bones, muscles, organs, and systems that make up the body. Gray's Anatomy is still widely used by medical students, physicians, and other healthcare professionals for its detailed illustrations and accurate descriptions of the human body. The latest edition is the 41st edition and is edited by Susan Standring.

Sagittal section of vertebral canal to show the lower end of the medulla spinalis and the filum terminale. Li, Lv. First and fifth lumbar vertebræ. Sii. Second sacral vertebra. 1. Dura mater. 2. Lower part of tube of dura mater. 3. Lower extremity of medulla spinalis. 4. Intradural, and 5, Extradural portions of filum terminale. 6. Attachment of filum terminale to first segment of coccyx. (Testut.)