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Updated: June 11, 2025
Our present mouth is probably not at all the mouth of the primitive ancestor of vertebrates. Thus in the insect three segments have fused around the mouth, and three, possibly four, in front of it. This makes a head worthy of the name. The ganglia of the three post-oral segments, which bear the jaws, have fused in one compound ganglion innervating the mouth and jaws.
In hysteria these parts of the body, as well as the tracts of mucous membrane proceeding from them, become the seat of new sensations and innervating changes in a manner similar to the real genitals when under the excitement of normal sexual processes.
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