(IMAGE (TYPE "GIF") (ORIGINAL-PATH "gifs/Syllabus Chapters/DescendingStemOrigin/vestibulo.medcord.gif") (PATH "gifs/NotAvailable.gif")) (OUTLINE-COLOR (NAME "YELLOW")) (STRING-COLOR (NAME "RED")) (PIN-COLOR (NAME "RED")) (FRAME-INFO (STRING "Vestibulospinal Tracts, Medulla and Spinal Cord Levels. \(Image modified from N.B. Everett, Functional Neuroanatomy. Lea & Febiger 1971, with permission of Williams & Wilkins\). The lateral vestibulospinal tract descends through the tegmentum to appear anteriorly in the spinal cord white matter. Its fibers end on interneurons throughout the spinal cord. It has a strong excitatory effect on spinal cord reflexes, controlling in particular, extensor muscle tone. The medial vestibulospinal fibers descend in the medial longitudinal fasciculus to appear in the spinal cord in the anterior funiculus; they extend only through cervical levels. The medial vestibulospinal tract is important in the coordination of head and eye movements, particularly in fixation of gaze.")) 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