Anatomy and physiology : designed for academies and families / by Calvin Cutter.

  • Cutter, Calvin, 1807-1873?
Date:
1847
Catalogue details

Licence: Public Domain Mark

Credit: Anatomy and physiology : designed for academies and families / by Calvin Cutter. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    fortunate person who is depressed by grief. The influence of the mind upon the circulation of the skin, is also seen in the instantaneous suffusion in blushing. There, the minute arteries of the skin, through which the lymph or white blood usually passes, become suddenly dilated and filled with red globules of arterial blood. 5th. When the skin is kept at a proper temperature. This is seen by comparing the pallid, contracted, and wrinkled appearance of the skin, when ex- posed to cold, with the smooth, full, and increased color that attends and follows the application of heat. 6th. When the arteries and veins are not compressed by clothing, or by any other means. This is illustrated by the paleness pro- duced when the skin is compressed by the finger or hand, which prevents the blood from passing through the arteries. Let the pressure be removed, and the color returns, from the restoration of the circulation. 7th. When the impure, saline, and oily matter, that collects on the skin, forming a pellicle, is frequently and regularly removed by ablutions, as this favors increased action of the oil-glands and perspiratory apparatus. This is demonstrated by comparing the dingy, pallid, and shrunken appearance of the skin before ablution, with the fullness and carnation glow which are exhibited after bathing. ANATOMY OF THE CUTANEOUS NERVES. The nerves, from the Latin, nervus, are spread over every part of the sensitive layer of the true skin. As a proof of this, no part of this tissue can be punctured with a fine needle, without transfixing a nerve, and inducing pain. In some parts of the system, the nerves are more abundant than in others; where the sense of feeling is most acute, we find the greatest number of nerves, and those of the largest size. Those parts which are most exposed to injury, are most sen- sitive. The conjunctiva, or skin of the eye, is pained by the presence of a particle of dust, because it would render vision imperfect. The lungs, also, would be injured by the smallest substance; they are therefore protected, by the exquisite sensitiveness of the lining membrane of the trachea, so that a particle of food or dust, is ejected by a convulsive cough, Give another. The fifth ? The sixth ? How is this illustrated ? The seventh ? How is this shown ? Describe the nerves of the skin. Are the nerves more abundant in some parts of the system than in others ? Where do w» find the greatest number ? Give illustrations.