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Updated: June 18, 2025
The latter are the peripheral and ubiquitous nerve-fibres; with their terminal apparatus, the sense-organs, etc., they constitute the conducting marrow or peripheral nervous system. Some of them the sensory nerve-fibres conduct the impressions from the skin and other sense-organs to the central marrow; others the motor nerve-fibres convey the commands of the will to the muscles.
The divine Supreme Person, all whose wishes are eternally fulfilled, who is all- knowing and the ruler of all, whose every purpose is immediately realised, having engaged in sport befitting his might and greatness and having settled that work is of a twofold nature, such and such works being good and such and such being evil, and having bestowed on all individual souls bodies and sense-organs capacitating them for entering on such work and the power of ruling those bodies and organs; and having himself entered into those souls as their inner Self abides within them, controlling them as an animating and cheering principle.
In fact, stimuli are continually playing upon the sense-organs and are arousing nervous currents which try to break over the boundaries of sleep and impress themselves upon the brain. For this reason, one who wishes to have untroubled sleep should remove all possible distractions. But apart from external distractions, wakefulness may still be caused by distractions from within.
The brain continually develops both through constant exercise and through natural selection. Through the higher and more delicate sense-organs it perceives a continually wider range of more subtile elements in its environment. And the higher the sense-organ the more directly and purely does it minister to consciousness.
Nor must it be urged against this that there is a determining reason for such an arrangement in so far as the tattvas of the Sankhyas form natural groups comprising firstly, the five organs of action; secondly, the five sense-organs; thirdly, the five gross elements; fourthly, the subtle parts of those elements; and fifthly, the five remaining tattvas; for as the text under discussion mentions the ether by itself, the possibility of a group consisting of the five gross elements is precluded.
Reflex action may be regarded as a comparatively mechanical, though often very complex, process; the reflex ganglia appear to be hardly more than switch-boards. There is stimulus of the sense-organs, and thus what Mr. Romanes has called "unfelt sensation," unfelt as far as the completion of the action is concerned.
Hitherto with feeble muscles and sense-organs it has hardly paid the animal to devote more material to building a larger brain. It was better to build more muscle. But now with stronger muscles at its command, and better sense-organs to report to it, every grain of added brain material is beginning to be worth ten devoted to muscle.
Head of a chick embryo, four days old, from below. n nasal pit, o upper-jaw process of the first gill-arch, u lower-jaw process of same, k double apostrophe second gill-arch, sp choroid fissure of eye, s gullet. Heads of chick embryos: 2.309 from the end of the fourth, 2.310 from the beginning of the fifth week. There is little to be said of the development of the lower sense-organs.
The sense-organs are indubitably among the most important and interesting parts of the human body; they are the organs by means of which we obtain our knowledge of objects in the surrounding world. Nihil est in intellectu quod non prius fuerit in sensu. They are the first sources of the life of the soul.
Nature of the evidence bearing on the origin of man Homologous structures in man and the lower animals Miscellaneous points of correspondence Development Rudimentary structures, muscles, sense-organs, hair, bones, reproductive organs, etc. The bearing of these three great classes of facts on the origin of man.
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