. The brain as an organ of mind. Brain; Thought and thinking; Brain. 22 THE USES AMD ORIGIN be seen in its earliest form as a barely recognizable structure in Sarsia.* From all this it would appear that the primitive ' nerve fibre' is a structure serving to connect impressions made upon the exterior of the organism with certain responsive muscular contractions quickly following thereupon. This is perfectly true, though only part of the truth. The path taken by stimuli from impressible surfaces to muscles is not generally ^ the shortest and most direct route. In the great majority of organ- ism
. The brain as an organ of mind. Brain; Thought and thinking; Brain. 22 THE USES AMD ORIGIN be seen in its earliest form as a barely recognizable structure in Sarsia.* From all this it would appear that the primitive ' nerve fibre' is a structure serving to connect impressions made upon the exterior of the organism with certain responsive muscular contractions quickly following thereupon. This is perfectly true, though only part of the truth. The path taken by stimuli from impressible surfaces to muscles is not generally ^ the shortest and most direct route. In the great majority of organ- isms these paths are more or less bent upon themselves. Those for ingoing impressions may run nearly parallel with one another towards some central situation ; and thence they may be distributed to muscles in various parts of the body—some of these being perhaps not very distant from the surface stimulated. In the latter case the track of the stimulus wave is found to be bent at an acute angle, or * reflected.' At the turning point or ' nerve centre,' whence impres- sions are distributed outwards in various directions to muscles, what are called ^ Nerve Cells ' become developed. * Since the above was written and in type the observations of Schafer (Proceed, of Eoy. Soc, January, 1878), and of 0. and R. Hertwig, have revealed tlie existence of distinct nerve tissues in several species of Fjg. Different kinds of Nerve Cells. (Magni- fied aboiit 350 diameters.). 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: 1539px × 1623px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbrain, booksubjecttho
