A Text Book of Anatomy, and Guide in Dissections; For the Use of Students of Medicine and Dental Surgery.cWashington R Handy
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1854 Excerpt: ...within. Only two of these tubercula are seen in fish and reptiles, and are viewed as the optic lobes, or the organs which receive and recognize the impressions of light, color, &c. The pineal gland, (Fig. 116, ) is situated upon the nates and is surrounded by the velum interpositum, a reflection of pia mater. It is an oblong, reddish body, composed of cineritious matter, and containing calcareous particles or gritty matter called acervulus, which on analysis is found to consist principally of phosphate and carbonate of lime. The posterior part of this gland is soft and called conarium. It is united to the thalami by two delicate processes, the pedunculi, which proceed forward on the inner margins of the thalami, and join the descending pillars of the fornix. A variety of opinions have been indulged in reference to the use of this gland. Des Cartes believed it to be the seat of the soul, arid Majendie that it closed the aqueduct of Sylvius, and thus cut off the communication between the third and fourth ventricles, while another and more plausible view makes it a commissural body. Thalami optici, or posterior ganglia, (Fig. 117.)--These ganglia are very prominent in the interior of the brain. They are situated upon the upper surface of the crura cerebri, and can be most readily got at by separating the hemispheres, and turning aside the corpus callosum and fornix, which cover them. The thalami are large, oval bodies, placed side by side in the longitudinal direction, about an inch and a half long, and three quarters of an inch in breadth and depth. They are convex superiorly and in-ternally, and form the floor of the lateral ventricles. They are separated in front by the tenia semi-circularis, from the corpora striata, and are connected behind to the tube...
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