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(FRAME-INFO (STRING "Summary. \(Spinal cord image modified from N.B. Everett, Functional Neuroanatomy. Lea & Febiger 1971, with permission of Williams & Wilkins\). The four pathways originating in the brainstem are indicated by colored lines passing through the sections. The rubrospinal path \(magenta\) crosses the midline at its origin in the midbrain, descends through the tegmentum in the central tegmental tract and appears in the spinal cord in the lateral funiculus near the corticospinal tract \(not shown\). It has its major influence on upper extremity proximal flexors. The medial and lateral vestibulospinal \(yellow\) and reticulospinal \(red\) tracts arise from vestibular and reticular nuclei in the pons and medulla. Their exact locations are not shown here, and only a portion of their ipsilateral components is indicated. They enter the cord in the anterior funiculus. The vestibulospinal and reticulospinal systems have a major influence on paravertebral and proximal limb extensors.  The tectospinal tract \(green\) is important in reflex head movements in response to visual stimuli.  In the spinal cord, the rubrospinal tract enters the anterior gray from the lateral funiculus. The other three tracts enter the anterior gray from the anterior funiculus."))
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