First Book on Anatomy, Physiology, and Hygiene, for Grammar Schools and Families

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Clark & Maynard, 1862 - Anatomy - 191 pages
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Page 135 - At any time of life, excessive and continued mental exertion is hurtful ; but in infancy and early youth, when the structure of the brain is still immature and delicate, permanent mischief is more easily...
Page 64 - ... ascends obliquely to the under surface of the arch of the aorta, where it divides into the right and left pulmonary arteries.
Page 89 - The lungs are two conical organs, situated one on each side of the chest, embracing the heart, and separated from each other by a membranous partition, the mediastinum. On the external or thoracic side, they are convex and correspond with the form of the cavity of the chest ; internally, they are concave to receive the convexity of the heart.
Page 66 - At certain intervals, they are furnished with valves, which allow the blood to flow toward the heart only. In general, they are nearer the surface of the body than the arteries. 195. • The CAPILLARIES constitute a microscopic net-work, and are so distributed through every part of the body as to render it impossible to introduce the smallest needle beneath the skin without wounding several of these fine vessels. They establish the communication between the termination of the arteries and the beginning...
Page 130 - Each spinal nerve arises by two roots, an anterior, or motor root, and a posterior, or sensory root. ROOTS OF THE SPINAL NERVES. The anterior roots arise somewhat irregularly from a linear series of foramina, on the antero-lateral column of the spinal cord, gradually approaching towards the anterior median fissure as they descend. The fibres of the anterior roots...
Page 117 - Two of the quadrangular papillary clumps composed of minute conical papillae, such as are seen in the palm of the hand or sole of the foot. 4. Deep layer of the derma, the corium. 5. Adipose cells. 6. A sudoriparous gland with its spiral duct, as are seen in the palm of the hand and sole of the foot. 7. Another sudoriparous gland with a straighter duct, such as is seen in the scalp. 8. Two hairs from the scalp, inclosed in their follicles; their relative depth in the skin is preserved. 9. A pair...

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