Spinomesencephalic tract - definition
aka spinotectal tract, the spinomesencephalic tract is part of the anterolateral system; it terminates in the periaqueductal gray of the midbrain. The periaqueductal grey is thought to be an area that is important to inhibiting or controlling pain sensations and so the spinomesencephalic tract contributes to that role.
Learn more:
2-Minute Neuroscience: Pain and the Anterolateral System
Spinomesencephalic tract represented by the purple nerve fiber traveling up from the spinal cord and synapsing in the periaqueductal gray in the midbrain.