. Cunningham's Text-book of anatomy. Anatomy. 674 THE NEEVOUS SYSTEM. Genu of corpus callosum Cavum septi pellucidi Septum pellucidum Caudate nucleus Column of fornix Vena terminalis Chorioid tela of third ventricle Vena interna cerebri Lj_Chorioid plexus of lateral ventricle ventriculi quarti, and it is in connexion with this portion of the pia mater that the chorioid plexuses of that cavity are developed. The tela chorioidea ventriculi tertii ( velum interpositum),is a fold of pia mater which is invaginated into the brain, so that it comes to he over the third ventricle and to project in
. Cunningham's Text-book of anatomy. Anatomy. 674 THE NEEVOUS SYSTEM. Genu of corpus callosum Cavum septi pellucidi Septum pellucidum Caudate nucleus Column of fornix Vena terminalis Chorioid tela of third ventricle Vena interna cerebri Lj_Chorioid plexus of lateral ventricle ventriculi quarti, and it is in connexion with this portion of the pia mater that the chorioid plexuses of that cavity are developed. The tela chorioidea ventriculi tertii ( velum interpositum),is a fold of pia mater which is invaginated into the brain, so that it comes to he over the third ventricle and to project in the shape of chorioid plexuses into the lateral ventricles. This invagination requires special notice. The tela chorioidea ventriculi tertii ( velum interpositum) is a double layer or fold of pia mater which intervenes between the body of the fornix, which lies above it, and the epithelial roof of the third ventricle and the two thalami, which he below it. Between its two layers are blood-vessels, and some subarachnoid trabecular tissue. In shape the chorioid tela of the third ventricle is triangular, and the narrow anterior end or apex reaches forwards as far as the interventricular foramina. The base lies under the splenium of the corpus callosum, and here the two layers of the tela separate and become continuous with the investing pia mater on the sur- face of the brain by passing out through a cleft called the trans- verse fissure. Along each lateral margin the tela chorioidea of the third ventricle is bordered by the chorioid plexus of the body of the lateral ventricle, which pro- jects into the ventricular cavity from under cover of the free lateral margin of the fornix. It should be borne in mind that the epithelial lining of the ven- tricle gives a complete covering to the chorioid plexus. Pos- teriorly the chorioid plexus is Fig. 599.—Dissection to show the Chorioid Tela of the C0ntinU0US with the similar Third Ventricle, and the Parts in immediate Rela- , ., .
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
