. A text-book in general physiology and anatomy. Physiology, Comparative; Anatomy. THE MBS AND STEENtfM 229 to the vertebrEB by two processes, one of which rests against the transverse process and the other against the centrum. At the front of the body the curved ends of the first seven pairs end in cartilages which unite them to the flat breastbone, or sternum. The eighth, ninth, and tenth pairs end in similar cartilages, but these are fused together into one common cartilage which is at- tached to the lower part of the breast- bone. The eleventh and twelfth pairs are not attached, and are ca
. A text-book in general physiology and anatomy. Physiology, Comparative; Anatomy. THE MBS AND STEENtfM 229 to the vertebrEB by two processes, one of which rests against the transverse process and the other against the centrum. At the front of the body the curved ends of the first seven pairs end in cartilages which unite them to the flat breastbone, or sternum. The eighth, ninth, and tenth pairs end in similar cartilages, but these are fused together into one common cartilage which is at- tached to the lower part of the breast- bone. The eleventh and twelfth pairs are not attached, and are called floating ribs. The sternum is a flat, irregular bone formed of three parts in the adult. The upper piece is broad, and the collar bones fit into notches in the top. On the sides are two other notches to which the first pair of ribs is 'attached. The middle piece is narrower, and to it are attached the fourth, fifth, and sixth pairs of ribs. The last piece has no rib attachments. The ribs are so arranged as to permit the expansion and contraction of the organs of the chest cavity and at the same time to protect the inclosed organs. We shall consider their action further in our study of Fig. 88 — Kibs and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Eddy, Walter Hollis, b. 1877. New York, Cincinnati [etc. ] American book Co
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