. Un texte-livre de physiologie animale, avec des chapitres d'introduction sur la biologie générale et un traitement complet de la reproduction ... La Physiologie, comparatif. Le cerveau. 545 que -ainsi que sa qualité peut être augmenté par l'utilisation, semble avoir été créé par les mesures, à différentes périodes de développement ', des chefs de ceux qui participent à l'achat de propriété intellectuelle, et de comparer les résultats avec ceux obtenus par des mesure de la tête de ceux qui ne sont pas spécialement employées ainsi. Bien sûr, on doit supposer que la tête est une jauge de mesure de la taille du cerveau, qui est d'environ tru

• Contributeur: The Book Worm / Alamy Banque D'Images
• ID de l’image: RE3T5N
• Taille du fichier: 7,1 MB (299,4 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 1257 x 1987 px | 21,3 x 33,6 cm | 8,4 x 13,2 inches | 150dpi

Informations supplémentaires

Cette image appartient au domaine public, ce qui signifie que le droit d’auteur a expiré ou que le titulaire du droit d’auteur a renoncé à ses droits. Les frais facturés par Alamy couvrent l’accès à la copie haute résolution de l’image.

Cette image peut avoir des imperfections car il s’agit d’une image historique ou de reportage.

. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. THE BRAIN. 545 as -well as its quality can be increased by use, seems to have been established by the measurements, at different periods of ' development, of the heads of those engaged in intellectual pur- suits, and comparing the results with those obtained by similar measurement of the heads of those not thus specially employed. Of course, it must be assumed that the head measurement is a gauge of the size of the brain, which is approximately true, if. â mm Fig. 396. Fig. 397. Fig. 396.âBrain of cat, seen from above (after Tiedemann). Fig. 397.âBrain of dog, seen from above (after Tiedemann). not entirely so. There are many facts which go to show that the habits of ancestors tend to become almost the instincts of posterity, even in the case of man. It has been noticed that a facility in the acquisition of scholarship (languages, literature) has, in many cases, been associated with scholarly habits in numerous generations of ancestors. The inheritance of mental traits, which can not be considered wholly apart from a physi- cal basis in the nervous system, and especially in the cerebrum, is a subject of great interest, but too wide for more than a pass- ing allusion here. Recent investigations seem to show that the development of the ganglion cells of the brain takes place first in the me- dulla, next in the cerebellum, after that in the mid-brain, and finally in the cerebral cortex. Animals most helpless at birth are those with the least development of such cells. The me- dulla may be regarded in some sense as the oldest (phylogeneti- cally) part of the brain. In it are lodged thoSe cells (centers) which are required for the maintenance of the functions'essen- tial to somatic life. This may serve to explain how it is that so many centers are there crowded together. It is remarkable that so small a part of the brain s

Recherche dans la banque de photos par tags

• bookauthormillswes
• bookcentury1800
• bookdecade1880
• bookyear1889