. The Journal of comparative neurology and psychology. VmotVsens. Fiu. lo. A model of the right half of the brain of the human embryo 11. 1!).from the level of the Vllth nerve to that of the Hid nerve. A, from themedial surface; B, from the lateral surface. The sulcus limitaus is indicatedby a dotted black line, and ou the outer surface and on the trigeminus theboundary line between sensory and motor structures is indicated in the sameway. The radix mesencephalica runs dorsal to the sulcus limitans throughits whole course. embryonic brains. First is the simplicity (if structure which enableson
. The Journal of comparative neurology and psychology. VmotVsens. Fiu. lo. A model of the right half of the brain of the human embryo 11. 1!).from the level of the Vllth nerve to that of the Hid nerve. A, from themedial surface; B, from the lateral surface. The sulcus limitaus is indicatedby a dotted black line, and ou the outer surface and on the trigeminus theboundary line between sensory and motor structures is indicated in the sameway. The radix mesencephalica runs dorsal to the sulcus limitans throughits whole course. embryonic brains. First is the simplicity (if structure which enablesone to trace the bundle Avith perfect ease and certainty. Second isthe clearness of the general morphological relations. It is easy todetermine whether the mesencephalic root and its nucleus of originlie in the sensory or in the motor zone of the l)rain. I was fortunateto receive in 1905 a human embryo which measured after fixation JOHNSTON, The Radix Mesencephaltca Trtgemini. 617 in formalin mm. The embryo is small for its stage of devel-opment.
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