Handbook of insanity for practitioners and students . - matter isalmost one-fourth the thickness of the hemispheres, butin the fourth month it diminishes to one-seventh. Va-rious layers are found even before this period; a deeperlayer of cellular elements often exhibits a wave-shape,. Fig. 2. while the outer boundary still runs in a straight line. Inthe middle of the layer of cellular elements, and also in adeeper layer, light bands appear, at the latest during thefifth month. But some of the cellular layers unite anddisappear during the later foetal months, so that their per-manent arrangemen
Handbook of insanity for practitioners and students . - matter isalmost one-fourth the thickness of the hemispheres, butin the fourth month it diminishes to one-seventh. Va-rious layers are found even before this period; a deeperlayer of cellular elements often exhibits a wave-shape,. Fig. 2. while the outer boundary still runs in a straight line. Inthe middle of the layer of cellular elements, and also in adeeper layer, light bands appear, at the latest during thefifth month. But some of the cellular layers unite anddisappear during the later foetal months, so that their per-manent arrangement can only be studied in the the fifth month a distinct nucleolus sometimes appearsin the round nuclei of certain cell-layers; a few nucleihave short processes so that they appear angular. Ganglion cells are only recognizable in the cortex of thefully developed foetus; indeed, distinct boundaries of pyra-midal cells are found only in infants of one to two months,and even here they are mingled with imperfectly developedcells. 8 HANDBOOK OF INSANITY. The simplest classification recognizes an external, mid-dle, and internal layer. At the beginning the cells arearranged like a string of pearls from without, inward; orwe may speak of a palisade-like or columnar arrangem
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