. The brain as an organ of mind. Brain; Thought and thinking; Brain. 96 THE NERVOUS SYSTEM OF ARTHROPODS. Fig. 3i. Fig. 35. ffanoiion sends off lateral nerves to a pair of limbs. The stomato-gastric nerves are connected with the posterior part of the brain or with the oesopha- geal cords, and they distribute them- selves over the alimentary canal in the usual manner. Among Crustacea great differ- ences are met with in the degree of concentration of the nervous system, the variations being, in the main, de- pendent upon differences of external form and in the arrangement of locomotor appendages
. The brain as an organ of mind. Brain; Thought and thinking; Brain. 96 THE NERVOUS SYSTEM OF ARTHROPODS. Fig. 3i. Fig. 35. ffanoiion sends off lateral nerves to a pair of limbs. The stomato-gastric nerves are connected with the posterior part of the brain or with the oesopha- geal cords, and they distribute them- selves over the alimentary canal in the usual manner. Among Crustacea great differ- ences are met with in the degree of concentration of the nervous system, the variations being, in the main, de- pendent upon differences of external form and in the arrangement of locomotor appendages, in the different representatives of the class. In some of the lower terms of the series, such as the Sandhopper and its allies, in which the body is elongated and com- posed of many almost similar seg- ments, the nervous system is not very different from that of many Worms. In the Sandhopper, indeed, the ven- FiG. Systena ^ ^ .^^^ ^^^^ ganglia (fig. 34) of the of Common Sandhopper to & â \ o / (Taiitrus locusta). (Grant.) two sidcs of the body are separate ganSl^eadfr^^^^^ ^01^ ouc auothor as they are in Ser- size as other ganglia situated p^Jg^ (^gg^ Q^), although the ganglia on the separate ventral cords. ^ p ⢠i t i Fig. System are here icwer m number and much of Cymothoa. (Grant.) Cere- jv^qt-o distiuct bral ganglia almost wholly absent from oesophageal 111 sHglltly higher formS of CrUS- ^^.a^L'SVewfl tacea, however, the two divisions of a siugie ventral cord, with ^he Originally double vcutral cord compound ganglia at inter- o -i , ,i i m i vais. always become fused together, whilst, at the same time, the equality of the. several ganglia diminishes. Thus, in such forms as the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bastian, H. Charlton. N. Y. , Appleton
Size: 910px × 2746px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbrain, booksubjecttho
