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Pain in the Trigeminal System: from Orofacial Nociception to Neural Network Modeling

Université d’Auvergne Clermont 1, INSERM E 0216, U.F.R. d’Odontologie, Faculté de Chirurgie Dentaire, 11, bd Charles-de-Gaulle, 63000 Clermont-Ferrand, France; alain.woda{at}u-clermont1.fr

View larger version (54K): [in this window] [in a new window]   Figure 1. Dorsal view of the brain stem with schematic drawing of the trigeminal sensory complex. The spinal nucleus is composed of oralis, interpolaris, and caudalis subnuclei. V1, V2, V3: ophthalmic, maxillary, and mandibular divisions of the sensory root of the trigeminal nerve. MDH: medullary dorsal horn (Villanueva and Raboisson, 1994).

View larger version (27K): [in this window] [in a new window]   Figure 2. Schematic representation of the organization of nociception in the trigeminal sensory complex. Two nociceptive neurones are represented in the oralis and caudalis subnuclei which send their axons to the thalamus. They receive C-fiber nociceptive input via at least one interneurone originating in the substantia gelatinosa. This organization allows for the recording of C-fiber activity from oralis neurones (C) during injection of neurochemicals into the substantia gelatinosa of the caudalis.

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