The gray commissure of the spinal cord is a critical anatomical structure that serves as a midline connector between the two halves of the spinal cord's gray matter. And extending from the foramen magnum to the conus medullaris, this thin band of gray matter bridges the left and right posterior halves, encircling the central canal within the spinal canal. Its strategic positioning makes it a point of reference for clinicians, neuroscientists, and anatomists alike, as it plays a subtle yet significant role in spinal cord physiology and pathology. Understanding the gray commissure requires a closer look at its anatomical boundaries, cellular composition, and the ways in which it interacts with the broader neural network of the central nervous system.
Anatomy and Location The gray commissure sits at the most interior aspect of the spinal cord, directly anterior to the central canal and posterior to the anterior median fissure. Even so, it is not a standalone column but rather a thin lamina of gray matter that stretches across the midline, connecting the two posterior gray columns. In cross-sectional views, the commissure appears as a circular or oval ring surrounding the central canal, which is filled with cerebrospinal fluid and lined by ependymal cells.
