124 ARTHROLOGY, OR ANATOMY OF ARTICULATIONS 



intercostal muscle and the sternum. The fibers are partly 

 oblique, vertical, and transverse. The vertical and oblique 

 fibers constitute the ligamentum corruscans (shining), and 

 seem to be undeveloped bundles of the external intercostal 

 muscle; they are strongest in the third to the seventh spaces. 

 The transverse fibers are present in the first to the seventh 

 spaces. 



The internal intercostal ligaments, ligamenta intercostalia 

 interna, are tendinous fasciculi of the triangularis sterni 

 muscle, passing from rib to rib over one or two spaces; in the 

 seventh and eighth spaces, sometimes sixth and ninth, they 

 are nearly transverse. 



The cartilages of the sixth, seventh, and eighth ribs, some- 

 times of the fifth and ninth, articulate by their lower borders 

 with the margins of the adjoining cartilage; each articulation 

 has a capsule and synovial membrane. All these articulations 

 may be wanting. 



In articulations of ribs with cartilages the cartilage is held 

 in a depression in the sternal end of the rib by periosteum. 



THE ARTICULATIONS OF THE STERNUM 



The gladiolus is united to the manubrium by an interposed 

 fibrocartilage, synarthrodial (Henle), or it may be, diarthrodial, 

 with a synovial membrane in 33 per cent, of cases rarely 

 so in childhood and probably results from absorption. The 

 ligaments are anterior and posterior intersternal; both consist 

 of longitudinal fibers blending with the chondrosternal liga- 

 ments, the anterior with the pectoralis major. 



The Temporomaxillary Articulation 



The ligaments are capsular, inter articular fibrocartU<ige, 

 external lateral, internal lateral, and sty lorn andibular. 



The capsule is very thin and loose; it passes from the edge 

 of the glenoid fossa to the interarticular cartilage, thence 

 to the neck of the condyle. 



The interarticular disk, or fibrocartilage (articular meniscus), 

 is placed horizontally between the jaw and temporal bone, 

 concavoconvex above and concave below. It is connected 



