. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. THE NERVOUS SYSTEM OF MAN. 37 Embryonic Development of Brain.—The funda- mental fact that the brain may be regarded as an inter- cranial continuation of the spinal cord, with swellings and outgrowths atop, is made evident by its em- bryonic development. The following figures give the stages of this develop- ment. In the very early stages the brain is a direct continuation of the Spinal FlG- 21.—Diagram showing the inter- lacing of dendrites of neurones. cord and consists of three
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. THE NERVOUS SYSTEM OF MAN. 37 Embryonic Development of Brain.—The funda- mental fact that the brain may be regarded as an inter- cranial continuation of the spinal cord, with swellings and outgrowths atop, is made evident by its em- bryonic development. The following figures give the stages of this develop- ment. In the very early stages the brain is a direct continuation of the Spinal FlG- 21.—Diagram showing the inter- lacing of dendrites of neurones. cord and consists of three hollow swellings or vesicles. These are what afterward become medulla (1), optic lobes (2), and thalamus (3). >' A. Fig. 22. We shall call these the hindbrain, the midbrain, and the forebrain (Fig. 22). The next step is the outgrowth of the cerebrum (cr) and olfactory lobes (of) from the fore-. 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 LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
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