. On the anatomy of vertebrates [electronic resource] . vora than in Ungulata: deeper in the pectoral muscles ofCheiroptera than in those of the legs : paler in the pectorals andother muscles of the fore-legs of the Kangaroo than in the f psoseand those of the hind-legs : palest in some Rodentia. § 192. The Diaphragm.—The chief characteristic of mammalianmyology is the diaphragm, vol. ii., fig. 139, d, which, as such, is notmore completely developed in Man than in the Monotreme. It isthe partition between the thoracic and abdominal cavities, fig. 1,vaulted and convex toward the thorax, fig. 2,
. On the anatomy of vertebrates [electronic resource] . vora than in Ungulata: deeper in the pectoral muscles ofCheiroptera than in those of the legs : paler in the pectorals andother muscles of the fore-legs of the Kangaroo than in the f psoseand those of the hind-legs : palest in some Rodentia. § 192. The Diaphragm.—The chief characteristic of mammalianmyology is the diaphragm, vol. ii., fig. 139, d, which, as such, is notmore completely developed in Man than in the Monotreme. It isthe partition between the thoracic and abdominal cavities, fig. 1,vaulted and convex toward the thorax, fig. 2, and consistsof carneous and tendinousparts, the latter chiefly in 1the expanded or aponeuro-tic form. The carneous fas-ciculi are divided into theand thealler mus-cles. The costal portionsarise from the ensiformcartilage, and those of theeighth to the twelfth ribs,by fasciculi which inter-digitate with those of thes transversalis abdominismuscle. They ascend andexpand, arching and con-verging to be inserted into VOL*. TIL ( costal6 vertebral or sm. Human diaphragm ; abdominal surface. the external 4 ligamentum arcuatum, 2 ANATOMY OF VERTEBRATES. fig. 1, d, and into the aponeurosis called ( centrum tendineumor cordiform tendon, ib., t. This centre is widely notchedtoward the spine, and divided anteriorly into three tracts, of whichthe right is usually the largest. Between the right and middle tractsis the orifice, c, for the inferior vena cava (< postcaval of Mam-mals). Behind the tendon, and to the left of the median line, isthe orifice, <?, for the oesophagus and pneumogastric nerves : the The diaphragm is most muscular, longest, and most oblique inCetacea, in which the central tendon is almost obsolete: by risingso far back, it permits the proportional extension of the lungs,which in the Dugong and Manatee act as air-bladders. In theperissodactyle Ungulates, in which the moveable ribs are numerousand continued to near the pelvis, the diaphragm is also extensive,and
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