Bulbothalamic Tract

Saturday, December 10, 2011

The bulbothalamic tract is a bundle of fibers which represents the extension of the posterior funiculi of the spinal cord (epicritic sensibility). These fibers originate in the gracile nucleus and the cuneate nucleus, cross as arcuate fibers (decussation of lemnisci), and form the medial lemniscus in the narrower sense. The cuneate fibers initially lie dorsally to the gracile fibers, while they lie medially to them in the pons and midbrain. They terminate in the thalamus.