ostensorium

n.; pl. E. Sensoriums L. Sensoria [ L., fr. sentire, sensum, to discern or perceive by the senses. ] (Physiol.) The seat of sensation; the nervous center or centers to which impressions from the external world must be conveyed before they can be perceived; the place where external impressions are localized, and transformed into sensations, prior to being reflected to other parts of the organism; hence, the whole nervous system, when animated, so far as it is susceptible of common or special sensations. [ 1913 Webster ]