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What is called lateral integration occurs in jointed inthe development of the nervous system. It is noticed that the characteristic feature oflower jointed animals and larvae of higher - except for the mostpart of the imperfect forms which have no distinct nodules isdouble chain of nerve knots, reaching from one end of the body to another; betweenthe more perfectly formed this dual jointed chainmerges to a greater or lesser extent, in one. Newport has described the course of thisconcentration in insects, and Rathke followed her in crustaceans. In the earlystage of development in the Astacus fluviatilis, or common (the river) cancerfound a pair of individual nodes in each ring. Out of fourteen couplesbelonging to the head and chest, three pairs of front of the mouth merge into a single mass,forming a brain or head knot. Meanwhile, the rest of the top six pairsconnect particularly in the midline, the others remain more or lessseparate. Of the six pairs of nodules formed thus, frontfour coalesce into one mass, the other two in another, and then these two massesalready connect one. Here we see longitudinal and transverse integration,occurring at the same time; the higher the cancers they both go even further.Vertebrates represent a distinct transverse integration in the developmentreproductive system.
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