Abstract
The charts used to indicate the place, extent and nature of sensory changes due to disease of the nervous system fall into two groups: those showing the distribution of peripheral nerves, and those showing the distribution of the spinal segments or posterior roots. The distribution of the trigeminal nerve is sometimes included in both these groups. When it is, it is usually that of the entire nerve root (Fig. 2) or that of the three main branches entering the gasserian ganglion (Fig. 3). The use of the word segmental is somewhat confusing. The terms segmental and radicular are often used interchangeably, and justly so when they apply to the spinal cord. This cannot be done in the case of the trigeminal, as will be shown presently. The word segmental should be limited to distributions of intramedullary origin. Some confusion arises from the fact that the first two of the three
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