. The Journal of comparative neurology and psychology. Fig. 29. The third section of this series ventral to the last. X 20- Theheavy lines to the left mark the outer surface of the brain. Description in thetext. sensory root and leaves the brain as a separate rootlet in this the mesencephalic root the bundle c joined the sensory root inFig. 29, the bundle h enters the sensory root in Eig. 30, while thebundle a appears as three small compact bundles, the last of whichis seen joining the sensory root in Fig. 31. The relations of the Johnston, The Radix Mcsencephalica Trigcmmi. 635 spin
. The Journal of comparative neurology and psychology. Fig. 29. The third section of this series ventral to the last. X 20- Theheavy lines to the left mark the outer surface of the brain. Description in thetext. sensory root and leaves the brain as a separate rootlet in this the mesencephalic root the bundle c joined the sensory root inFig. 29, the bundle h enters the sensory root in Eig. 30, while thebundle a appears as three small compact bundles, the last of whichis seen joining the sensory root in Fig. 31. The relations of the Johnston, The Radix Mcsencephalica Trigcmmi. 635 spinal trigeminal tract, the cochlearis, the facialis and the trapezoidbody are dra^vn for the sake of Vlf tr Fig. 30. The fifth sectiou of this series ventral to the last, x 20. Descrip-tion in the text. The horizontal sections of the 37 cm. foetus fully support thedescription of the mesencephalic root in the transverse sections of 636 Journal of Comparative Neurology and Psychology. the 27 and 42 cm, stages. The general conclusion may be statedthus: in the human embryo of mm. the mesencephalic root ofthe trigeminus is connected with the sensory root and is clearly notconnected with the motor root or nucleus, but is widely separated
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