This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...in dilation of blood-vessels and in pulse, in respiration, and in the movements of face and limbs--condition and accompany the ...
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...in dilation of blood-vessels and in pulse, in respiration, and in the movements of face and limbs--condition and accompany the emotions. But we have not completed our study of the bodily conditions of emotion until we try to discover the brain or nerve changes which condition these changes in pulse, respiration, and the rest. A probable account of these brain changes is the following. First, (a) sensory brain-centres are excited through perception or imagination of a given object; next (V) the excitation of these sensory neurones spreads to the brain-centre of bodily sensations and movements, that is, to the region forward and back of the fissure of Rolando, and there excites motor cells. This excitation of the motor neurones of the Rolandic region is then carried (1) downward to lower brain-centres in the medulla oblongata, which control the unstriped muscular coatings of inner organs of the body, such as blood-vessels, heart, and intestines. In this way the internal circulatory changes are brought about: the heart-beat and pulses are checked or increased, and the arteries (not the big ones near the heart, but the smaller, thin-walled vessels in outlying parts of the body) are dilated or constricted, thus occasioning either a flush and rising temperature or pallor and chilliness. The downward excitation is carried (2) to the striped or skeletal muscles attached to the bones of the body, and thus the 'external' changes in breathing and muscular contraction are occasioned. Both sorts of bodily change, the ' internal' and the ' external, ' excite end-organs of pressure, and the internal changes excite also end-organs of warmth and cold; and these excitations of the end-organs of pressure and of warmth or cold are carried upward by ingoing nerves to..
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