. Animal physiology. Physiology, Comparative; Physiology, Comparative. RIBS AND STERNUM. 467 into bone. The cartilages of the first seven ribs (in Man), which are termed the true ribs, are united to the sternum or Muscles of Neck Vertebral Column Ribs Intercostal) Muscles. - -' Clavicle .- 3rd Rib Sternum Diaphragm 7th Rib \False Ribs Diaphragm Vertebral Column Diaphragm Fig. 216.—Thorax of Man. breast-bone, which forms the front wall of the thorax. The cartilages of the five lower ribs are not directly connected with this, and they are hence called false ribs; those of three of them, however,
. Animal physiology. Physiology, Comparative; Physiology, Comparative. RIBS AND STERNUM. 467 into bone. The cartilages of the first seven ribs (in Man), which are termed the true ribs, are united to the sternum or Muscles of Neck Vertebral Column Ribs Intercostal) Muscles. - -' Clavicle .- 3rd Rib Sternum Diaphragm 7th Rib \False Ribs Diaphragm Vertebral Column Diaphragm Fig. 216.—Thorax of Man. breast-bone, which forms the front wall of the thorax. The cartilages of the five lower ribs are not directly connected with this, and they are hence called false ribs; those of three of them, however, are connected with the cartilage of the seventh rib; and the other two ribs, being completely unattached at their anterior ends, are termed floating ribs. The sternum or breast- bone is flat and of simple form in Man; but it is much larger in many other animals. In those which have need of great strength in the upper limbs, such as Birds, Bats, and Moles, it is not only increased in breadth, but is furnished with a project- ing keel or ridge, for the attachment of powerful muscles (§. 89). In the Turtle tribe, on the contrary, it is very much extended on the sides, so as to afford, with the ribs, a complete protection to the contained parts (§. 92).. 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 Carpenter, William Benjamin, 1813-1885. London : Wm. S. Orr and Co.
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