TY - CHAP M1 - Book, Section TI - The Spinal Cord and Approach to Myelopathy A1 - Berkowitz, Aaron L. PY - 2016 T2 - Clinical Neurology and Neuroanatomy: A Localization-Based Approach AB - The spinal cord begins where the medulla ends, running from the foramen magnum at the base of the skull to about the level of the first lumbar vertebra (L1) (Fig. 5–1). The spinal cord is divided into cervical, thoracic, lumbar, and sacral regions. The cervical and thoracic regions of the spinal cord correspond to the cervical and thoracic regions of the spinal column. However, the spinal cord is shorter than the spinal column, and so the lumbar region of the spinal cord actually corresponds to the lower thoracic spine, and the sacral region of the cord is housed in a short region called the conus medullaris at about the level of the L1-L2 vertebrae. Throughout the spine, dorsal roots enter and ventral roots exit through the neural foramina of the vertebrae that correspond to their spinal cord level of origin/exit. At cervical and thoracic levels, the corresponding foramina are essentially adjacent to the spinal cord levels with which they are associated. Since the spinal cord ends at L1, below L1, the lumbosacral nerve roots (cauda equina) must descend to reach their corresponding exiting foramina (discussed further in Chapters 15 and 17). SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/11/07 UR - accessmedicine.mhmedical.com/content.aspx?aid=1192637613 ER -