A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . morphological landmarks, since the organs in thisplane have suffered least modification throughunctional adaptation because of the fact that noneuroblasts are differentiated within the roof plateand floor plate of the neural tube. In fact, a series functions. The remainder of the diencephalon andall of the telencephalon except a very small vestigein the vicinity of the optic chiasma (Johnston)develops from the dorsolateral, or sensory lamina ofthe neural tube. 287


A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . morphological landmarks, since the organs in thisplane have suffered least modification throughunctional adaptation because of the fact that noneuroblasts are differentiated within the roof plateand floor plate of the neural tube. In fact, a series functions. The remainder of the diencephalon andall of the telencephalon except a very small vestigein the vicinity of the optic chiasma (Johnston)develops from the dorsolateral, or sensory lamina ofthe neural tube. 287 Brain. Anatomj- of REFERENCE HANDBOOK OF THE MEDICAL SCIENCES Two pairs of important lateral evagiuations arisefrom thjs part of the neural tube. One pair arisesfrom the sensory lamina of the diencephalon andproduces the lateral eyes; the other pair arises farther. Inner rhombic furrow Rhombic lip general visceral reflexes and their discharge into the motor centers of the tegmentum. The epithalanius is developed wholly within the dorsolateral or sensory lamina. It includes theepiphjsis or pineal body and someadjacent gray centers, of which themost important is the latter, like the hypothalamas,receives important olfactory tractsfrom the basal olfactory nuclei andfrom the hippocampus of the telen-cephalon (these entering by way ofOuter rhombic furrow the stria meduUaris thalami) anddischarges by waj- of the fasciculusretroflexus of Mejrnert into thetegmentum. The thalamus is developed partlyfrom the motor lamina, but chieflyfrom the sensorv lamina above thesulcus limitans (Figs. 887, 896, 891,892). In the embryo of five weeks(Fig. 896) the motor part is seen asa distinct eminence in front of theX. X. (MeduUarj- XI) tegmental swelling and above the .-Uar plate Sulcus limitans Tractus soUtariusInner layer Mantle layerMaiginal layer Bas


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