A guide to human and comparative phrenology : With observations on the national varieties of the cranium, and a description of DrsGall and Spurzheim's method of dissecting the human brain . aluable information by perusing work, entitled, Anatomie comparree ducerveau dans les quatres classes des animaux ver-t£br6s appliqu^e kla Physiologie et a la Pathologie duSyst^me Nerveux. Paris, 1827. Also Drs. Galls andSpurzheims work? on the anatomy of the brain. 37 body which are formed in the centre of carti-lages, while those constituting the skull areformed between two membranes, that is to
A guide to human and comparative phrenology : With observations on the national varieties of the cranium, and a description of DrsGall and Spurzheim's method of dissecting the human brain . aluable information by perusing work, entitled, Anatomie comparree ducerveau dans les quatres classes des animaux ver-t£br6s appliqu^e kla Physiologie et a la Pathologie duSyst^me Nerveux. Paris, 1827. Also Drs. Galls andSpurzheims work? on the anatomy of the brain. 37 body which are formed in the centre of carti-lages, while those constituting the skull areformed between two membranes, that is tosay, the pericranium externally, and thedura-mater internally. At a very shortperiod after conception, generally about threeweeks, we find a nucleus secreted by the ar-teries of little points of bony matter, con-gregated together. These increasing as theanimal advances in age, form fibres, andthen diverge into radii, from the centre ofthe bone; while the point from which theytook their origin, and where the particles ofbone were first deposited, are denominatedby anatomists the centre of ossification. Isubjoin an engraving of the foetal skull,which will illustrate my observations.*. * Reduced from the engraving in Mr. Lizars splen-did s)stem of anatomical plates. 38 EXPLANATION. AAA The centres of ossification.—2? Theanteriorfontanels,—C C C The union of the bones by mem-branes. Organic differences of the cranium in thefoetal and adult states. The infant skull differs much in its forma-tion with that of the adult. The peculiaritiesof the former principally consist in the follow-ing:— 1. In the absence of the sutures, and theunion of the bones by membranes. 2. Membranous apertures, denominatedfontanellse on the crown and back part of thehead. 3. Absence of the frontal sinuses. 4. The two tables of the skull being scarcelyvisible. 5. The frontal bone separated into two,and the occipital into four pieces. I shall make a few remarks on the necessityof these peculiarities exi
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Keywords: ., bookauthors, bookcentury1800, booksubjectphrenology, bookyear1831
