The anatomy of the nervous system, from the standpoint of development and function . E DIENCEPHALON AND Till! (tlTIC NERVE 2I5 the stria medullaris thalami. This fascicle, together with the closely relatedhabenular trigone and the pineal body, belong to the epithalamus and will bedescribed later. The dorsal surface of the thalamus is slightly convex and is divided by a faintgroove into two parts: a lateral area, covered by the lamina affixa and forminga part of the floor of the lateral ventricle; and a larger medial area, which formsthe floor of the transverse fissure of the cerebrum. The obli
The anatomy of the nervous system, from the standpoint of development and function . E DIENCEPHALON AND Till! (tlTIC NERVE 2I5 the stria medullaris thalami. This fascicle, together with the closely relatedhabenular trigone and the pineal body, belong to the epithalamus and will bedescribed later. The dorsal surface of the thalamus is slightly convex and is divided by a faintgroove into two parts: a lateral area, covered by the lamina affixa and forminga part of the floor of the lateral ventricle; and a larger medial area, which formsthe floor of the transverse fissure of the cerebrum. The oblique groove separat-ing these two areas corresponds to the lateral border of the fornix (Figs. 154, 155).The lamina affixa is part of the ependymal lining of the lateral ventricle superim- Fornix t , Transverse fissure of the cerebrum Stratum zonale Chorioid plexus of lateral ventricleLamina affixa Internal medullarylamina Chorioid plexus ofthird ventricle Third ventricle Lenticular nucleus Stria medullaris ?, Corpus callosumLateral ventricle Internal capsule Hypothalamicnucleus. Caudate nucleus Stria tcrminalisand vena ter-minalis _ External medull-ary lamina --^Anterior nucleusof thalamus «§»-,^Lateral nucleusof thalamus - Medial nucleusof thalamus Red nucleus ? Substantia nigra • Optic tractBasis pedunculi Fig. 155.—Diagrammatic frontal section through the human thalamus and the structures which immediately surround it. posed upon this part of the thalamus. It is not present in the sheep, where thefornix is larger and the entire dorsal surface of the thalamus belongs to the floorof the transverse fissure. These features are well illustrated in Figs. 179 and180, as is also the position of the transverse fissure. This fissure intervenes be-tween the thalamus and the cerebral hemisphere, and contains a fold of piamater, known as the tela chorioidea, of the third ventricle. The medial surface of the thalamus forms the lateral wall of the third ven-tricle (Figs. 158, 159).
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectnervoussystem, bookye
