Le Britannica encyclopdia ; un dictionnaire des sciences, des arts, de la littérature et de l'information générale . il est en flexion de cette concavité ventrale. La troisième à apparaître a un convexityand ventrale pontine est connue sous le nom, puisqu'elle marque le site de l'futurepons Varolii ; elle ressemble à la flexion permanente dans le reptilianbrain. Il va maintenant être vu que l'original canal neural, qui est linedby épithélium cilié, forme les ventricules du cerveau, whilesuperficial à cet épithélium (épendyme) le gris et blanc, matteris a ensuite formé. Il a été démontré par son wholeneural que le tube peut être div

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The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . he concavity ofthis flexure is ventral. The third to appear has a ventral convexityand is known as the pontine, since it marks the site of the futurepons Varolii; it resembles the permanent flexure in the reptilianbrain. It will now be seen that the original neural canal, which is linedby ciliated epithelium, forms the ventricles of the brain, whilesuperficial to this epithelium (ependyma) the grey and white matteris subsequently formed. It has been shown by His that the wholeneural tube may be divided into dorsal or alar, and antral or basallaminae, and, as the cerebral hemispheres bud out from the dorsalpart of the anterior primary vesicle, they consist entirely of alarlaminae. _ The most characteristic feature of the human and anthro-poid brain is the rapid and great expansion of these hemispheres, especially in a backward direction, so that the mesencephalon andmetencephalon are hidden by them from above at the seventhmonth of intra-uterine life. At first the foramina of Munro form. suiciriF.acc SiaCPAR. From Cat. R.CS. England.Fig. 23.—^Lateral view of cerebral hemisphere of Gorilla {Anthropopithecus gorilla). a communication not only between the third and lateral ventricles, but between the two lateral ventricles, so that the cavity of eachhemisphere is continuous with that of the other; soon, however, a median longitudinal fissure forms, into which the mesoderm growsto form the falx, and so the foramina of Munro are constricted intoa V-shaped canal. In the floor of the hemispheres the corporastriata are developed at an early date by a multiplication of nervecells, and on the external surface a depression, called the Sylvianfossa, marks the position of the future central lobe, which is after-wards hidden as the lips of the fossa (opercula) gradually close inon it to form the Sylvian fissure. The real fissures are completeinfoldings of the whole thickness of the vesi

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