. The American journal of anatomy. ch thicker. A cal Collection. Frontal series 514. Section 7T;i. large vessel is seen in the x-^s-Sdiams. mesenchymal tissue ventrad to the epiphysis. Its position is very char-acteristic. It gives off luanclies which supply the choroid plexus of thethird ventricle, and the vessel then divides dorsad to the paraphysis,and each terminal branch supplies the choroid plexuses of the lateralventricles posterior to the foramina of Munro. Fig. 4 is a frontal section of an embryos l)raiu 45 mm. It is cutobliquely to the cavity of the paraphysis, as seen in Fig. 3. The
. The American journal of anatomy. ch thicker. A cal Collection. Frontal series 514. Section 7T;i. large vessel is seen in the x-^s-Sdiams. mesenchymal tissue ventrad to the epiphysis. Its position is very char-acteristic. It gives off luanclies which supply the choroid plexus of thethird ventricle, and the vessel then divides dorsad to the paraphysis,and each terminal branch supplies the choroid plexuses of the lateralventricles posterior to the foramina of Munro. Fig. 4 is a frontal section of an embryos l)raiu 45 mm. It is cutobliquely to the cavity of the paraphysis, as seen in Fig. 3. The twolateral ventricles, witli i)ortions of their choroid plexuses, the cavityof the forebrain with its clioroid folds and optic thalami on each side,are all easily identified. The velum stretches transversely across theroof of the forebrain, between the paraphysis and tlie choroid plexus,and is continuous with the mesenchyma surrounding the optic is situated dorsad to the ]iarapliysis. The ])araphysis is seen lying in2. rs The Paraphysis in the Common Fowl the mesenchymal tissue ventrad to the forebrain, and appears as anirreguhir ring of ectodermic tissue. Two of the above-mentioned ves-sels, which supply the choroid plexus, are met in this section. Fig. 5 represents a sagittal section of a ten-days chickens section is not exactly in the median plane, consequently the choroidplexus has been separated from the roof of the third ventricle. Itseemed to me to be unnecessary to draw in all the structures that havebeen previously represented. The epiphysis and both commissures areomitted. The picture, when taken as a whole, resembles very closelyFig. 3, an embryo of 43 mm. The dorsal wall of the posterior velararch is even more perpendicular than in the above-mentioned tends to make the angle formed by the two limbs much more acute, so that now both are quite position of the anterior arm haschanged very little, but the choroid plex
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
