The anatomy of the nervous system, from the standpoint of development and function . we shall learn, the cortex does not differentiate in exactly the same man-ner throughout, but may be subdivided into structurally and functionally dis- THE EXTERNAL CONFIGURATION OF THE CEREBRAL HEMISPHERES 231 tinct areas. The sulci develop in more or less definite relation to these areas,the great majority making their appearance along the boundary lines betweenthem. These are known as terminal sulci, of which the rhinal fissure and centralsulcus are examples. Sometimes the folding occurs entirely within suc
The anatomy of the nervous system, from the standpoint of development and function . we shall learn, the cortex does not differentiate in exactly the same man-ner throughout, but may be subdivided into structurally and functionally dis- THE EXTERNAL CONFIGURATION OF THE CEREBRAL HEMISPHERES 231 tinct areas. The sulci develop in more or less definite relation to these areas,the great majority making their appearance along the boundary lines betweenthem. These are known as terminal sulci, of which the rhinal fissure and centralsulcus are examples. Sometimes the folding occurs entirely within such anarea, i. <\, along its axis, producing what is known as an axial sulcus. Butthere are still others in which the relation to these functional areas is not so evi-dent. The arrangement of the fissures and sulci in a seven month fetus is shownin Fig. 164. The Development of the Septum and Commissures.—The two hemispheresare connected by the lamina terminalis, which serves as a bridge for fibers whichcross from one hemisphere to the other. These form three important bundles:.
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