Analysis of the distribution of the sensory units in the infraorbital nerve innervating the upper facial area in the cat.
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The distribution of the sensory units innervating the upper face was analyzed incats anesthetized with sodium pentobarbital. The infraorbital nerve trunk innervating the upper face was composed of several nerve fascicles at the orbit. The receptive field of each fascicle was defined by recording the nerve action potentials responding to the mechanical stimulation of the facial area. The cross sectional area of each fascicle and the size of its corresponding receptive field were measured by the image analyzing method. The value calculated by dividing the former by the latter was adopted to compare the relative density of the sensory units among various facial areas. The relative density in the apex of the nose and the upper lip was larger than that in the dorsum of the nose and the area below the eyelid. This suggests that the sensory units were more densely distributed in the apex of the nose and the upper lip. The size of the receptive field of each sensory unit was measured by means of the single unit recording responding to the mechanical stimulation of the facial area. Sensory units innervating the apex of the nose and the upper lip had smaller receptive fields than those in the other areas. A significant correlation was recognized between the size of the receptive field and the density of the sensory units. These findings support theprevious findings in man that the frontal part of the face is more sensitive than the other part of the upper face.
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