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       (PATH "gifs/Syllabus Chapters/SomatoSpthal/Spthalmedulla.gif"))
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(FRAME-INFO (STRING "Spinothalamic Tract, Medulla. The spinothalamic tract \(black line\) is laterally-placed in the medulla, and is joined in the pons by the medial lemniscus \(which moves laterally as it ascends\). Primary pain fibers from the face descend in the spinal trigeminal tract giving off collaterals in the caudal medulla all the way to C2 spinal cord segment; the fibers terminate in the accompanying spinal trigeminal nucleus.  The secondary pain fibers arise from the spinal trigeminal nucleus, cross the midline and join the spinothalamic tract \(trigeminal components shown in green\). Such secondary fibers conveying facial pain are sometimes called the \"trigemino-thalamic tract\". Note: many of the crossed fibers take up a rostralward course before reaching the spinothalamic tract, and are thus distributed  across the tegmental field between the medial lemniscus and spinothalamic tract as they ascend through the medulla. They are not shown in this image."))
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