File:Carpenter's principles of human physiology (1881) (14779392174).jpg

Identifier: carpentersprinci00carp (find matches)
Title: Carpenter's principles of human physiology
Year: 1881 (1880s)
Authors: Carpenter, William Benjamin, 1813-1885 Meneses, Henry Power
Subjects: Human physiology Physiology
Publisher: London : J. & A. Churchill
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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arated from each mesaraic arteries; Pv, protovertebroe; x, is placed at the , j /• „, ii,A c„„t- «™^U~,-.1 point of divergence of the spianchnopieure folds. The other, and from the tiist cerebral blind foregut begins here, and extends about up to y. vesicle by constrictions, SO that instead of a single cerebral vesicle there are now, in addition to the opticvesicles, a series of them one behind the other. The most anterior of these,or the first cerebral vesicle, is developed into the fore-brain, the second intothe mid-brain, and the third into the hind-brain. Before the end of the secondday the first cerebral vesicle has begun to bud-off two small vesicles in front;these are the vesicles of the cerebral hemispheres, which subsequently becomethe most conspicuous part of the brain. As these are formed, owing to the morerapid growth of the upper surface of the body, the fore-brain, with the cerebraland optic vesicles, becomes slightly bent downwards over the anterior extremity
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DEVELOPMENT OF THE BRAIN. 955 of the notochord, and this is the commencement of the cranial flexure. Thecavity in the interior of each of the two vesicles of the cerebral hemispheresoriginating in the manner just described, constitutes the lateral ventricle,whilst the cavity of the fore-brain from which they were budded-off, remainsas the cavity of the third ventricle, or, as Foster and Balfour term it, the tween-brain. On the summit of the tween-brain the rudiment of the pinealgland makes its appearance, whilst the floor is produced into the infundibulum,which joins a process of the alimentary canal to form the pituitary body. Theroof of the mid-brain becomes developed into the corpora bigemina or optic lobesin Birds, but into the corpora quadrigemina in Mammals ; its floor is formed bythe crura cerebri, and its cavity becomes reduced to the iter a tertio ad quartumventriculum. In the mid-brain or third cerebral vesicle a constriction appearsin the course of the third day, which indi

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