. Quain's Elements of anatomy. e and double synovial cavity;13, the costo-clavicular or rhomboid ligament. in the articulations of the sixth and seventhcartilages. The cartilage of the first ribis almost always directly united to thesternum. A variable fasciculus of fibres connect-ing the cartilage of the seventh rib and?sometimes likewise that of the sixth, with the xiphoid cartilage, is cahed the costo-xiphoid. ligament. The iNTEECHONDRAL ARTICULATIONS are Synovial joints formed by the processeson the adjacent margins of some of the costal cartilages, viz., from the fifth (sometimesthe sixth
. Quain's Elements of anatomy. e and double synovial cavity;13, the costo-clavicular or rhomboid ligament. in the articulations of the sixth and seventhcartilages. The cartilage of the first ribis almost always directly united to thesternum. A variable fasciculus of fibres connect-ing the cartilage of the seventh rib and?sometimes likewise that of the sixth, with the xiphoid cartilage, is cahed the costo-xiphoid. ligament. The iNTEECHONDRAL ARTICULATIONS are Synovial joints formed by the processeson the adjacent margins of some of the costal cartilages, viz., from the fifth (sometimesthe sixth) to the eighth or ninth, surrounded by short capsules. The joints arestrengthened anteriorly by oblique ligamentous fibres, derived fiom the anteriorintercostal aponeuroses which occupy the fore parts of the intercostal spaces. Connection of the ribs with the cartilages.—The external extremitiesof the cartilages are fixed into the oval depressions on the ends of the ribs, and theunion receives support from the A synovial joint is occasionally formed between the first rib and its cartilage, or in theouter part of the cartilage when ossification around the latter is far advanced. (Luschka, Die anomalen Articulation en des ersten Eippenpaares, Wiener Sitzungsber., 1860 ; W. A. Lane,Guys Hosp. Eeports, xliii.) MOVEMENTS OF THE RIBS. 161 Sternal articulations.—The manubrium and Ijody of the sternum are unitedby a symphysis, the disc being composed of a layer of cartilage above and below,with a central fibro-carfcilagiuous stratum, in which a cavity is frequently articulation is farther supported by anterior and posterior ligamentous fibres,which have chiefly a longitudinal direction, and are most developed on the back ofthe sternum. The whole sternum is much strengthened by thick periosteum andthe radiating fibres of the chondro-sternal ligaments already mentioned. A layer Fig. 187.—Diagram of first and seventh ribs, in con-nection WITH THE SPINE AND T
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