THE BULBAR PROJECTION OF THE TRIGEMINAL NERVE

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Abstract
The character and distribution of action potentials recorded from points within the medulla of the cat upon electrical stimulation of peripheral branches of the 3 trigeminal divisions are described. In their course in the sensory root and spinal 5th tract, fast conducting fibers of the 3 trigeminal divisions are laminated in a dorso-ventral order which is the inverse of their distribution in the face. Fibers of the mandibular division are detected as far caudally as the obex; those of the maxillary and ophthalmic divisions as far caudally as the 1st cervical segment. The neurons of the spinal 5th nucleus fired by primary fibers of the 3 trigeminal divisions are laminated in a dorso-ventral order similar to that of the spinal 5th tract, but with greater overlap. Secondary trigeminal pathways pass diffusely across the reticular formation to the ventro-medial part of the opposite side of the medulla and ascend in relation to the medial lemniscus.

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