Archive image from page 257 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 1042 THORAX. internal measurements (cubic or diameter) clearly bear no relation to the height or weight of the man, whilst vital capacity does so in an exact ratio. If we take a cast of the thoracic cavity and view the base, it presents the shape of the figures in diagram 'fig. 669. which gives a mean measurement, in the males of forty-six, and in females of thirty-five, superficial inches. In the diagram (reduced by scale), we affix the height of each cas
Archive image from page 257 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 1042 THORAX. internal measurements (cubic or diameter) clearly bear no relation to the height or weight of the man, whilst vital capacity does so in an exact ratio. If we take a cast of the thoracic cavity and view the base, it presents the shape of the figures in diagram 'fig. 669. which gives a mean measurement, in the males of forty-six, and in females of thirty-five, superficial inches. In the diagram (reduced by scale), we affix the height of each case, and the area in su- perficial inches of such section. But the base of the thorax presents another measurement, that of the absolute area of the diaphragm. By the Jigs. 2. and 3., art. DIA- PHRAGM, this muscle will be noticed as a large muscle of a vaulted form. 670. repre- ents a section of a thorax, the measurement of Fig. 670. 101 outside. 74 inside Dimensions of the diaphragm in three stages. C, ordinary stage. B, spread out A, completely extended. D, relative difference between expiration and inspiration. which is forty superficial inches; the figure B, next above, is the diaphragm of the same per- son spread out, which is extended to 110 square inches, being nearly three times the area of the former figure ; even in this con- dition the centre is quite free, and not upon the stretch, though the circumference is so. The full measurement is nearly obtained, by slitting up the sides, as shown in figure A. and this condition gives it an increase of twenty-two superficial inches, making alto- gether 133 square inches; but even in this con- dition the entire arched muscle is not perfectly spread out. This was the diaphragm of a man five feet six inches high, with an exceedingly By 'vital capacity 'is meant the measure of the mobility of the chest, as more fully explained hereafter. (P. 1056.) small chest, only twenty-nine inches in ex- ternal circumference, and w
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