Archive image from page 263 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 1048 THORAX. ribs is very oblique'; the spine is curved ; therefore the relation of the ribs to the spine is different according to the curve, as are the bars to the body representing the spine (fig. 679.). It will be seen that the inferior six or seven ribs are at a more oblique angle to the spine than the superior ribs. The spine does not curve sufficiently to bring the upper ribs to an angle of 90° with the spine; there- fore, if all the ribs were raised
Archive image from page 263 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 1048 THORAX. ribs is very oblique'; the spine is curved ; therefore the relation of the ribs to the spine is different according to the curve, as are the bars to the body representing the spine (fig. 679.). It will be seen that the inferior six or seven ribs are at a more oblique angle to the spine than the superior ribs. The spine does not curve sufficiently to bring the upper ribs to an angle of 90° with the spine; there- fore, if all the ribs were raised simultane- ously, they would all increase the breadth of their intercostal spaces, whilst their sternal end would recede from the vertebrae, and thus, by their elevation, the thoracic cavity would be enlarged, until they attained the angle of 90° to the spine. But if the elevation were carried beyond this point, the intercostal spaces would diminish, and thus the thoracic cavity would decrease. Fig. 684. is a pos- terior view showing the sloping position of the ribs more clearly. Now, if the spine were perfectly erect, the ribs would have a greater range, and consequently the upper ribs could be elevated higher, and thus still more increase the thoracic cavity. A man Fig. 680. Tlwrax as at death. can expire a greater volume of air when perfectly erect, than in any other position. On the other hand, if we curve the spine, we limit the divergence of the ribs, because then we bring the ribs more into the po- sition of a b and a'b' (fig. 678.). Thus, in diseases of the spine, when angular cur- vature is extensive, the ribs are materially limited in their capability of increasing the perpendicular depth of their intercostal spaces, and consequently the perpendicular depth of the thorax. Fig. 666. is an instance of angular spine, reducing the ribs to their minimum distances without their moving. We have found by ex- periment, that the greatest volume of air which persons with
Size: 1220px × 1640px
Photo credit: © Bookive / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 1840, 1849, anatomy, archive, book, bookauthor, bookdecade, bookpublisher, booksubject, bookyear, drawing, historical, history, illustration, image, london_sherwood_gilbert_and_piper, page, physiology, picture, print, reference, todd_robert_bentley_1809_1860, vintage, zoology
