. The anatomy of the human body. Human anatomy; Anatomy. 136 ARTHROLOGT. Fig. 69. u /7. Acromio-clavicular Articulation (fig. 69). Articular Surfaces.—The clavicle and the acromion process oppose to each other a plane, elliptical surface, with its greatest diameter directed from before backward. The articular surface of the clavicle looks somewhat obliquely downward and outward, the acromial facette looks obliquely upward and inward. The extent of these surfaces va- ries greatly in individual cases, dependant on the degree of exercise to which the joint is subjected.* Means of Union and Provis
. The anatomy of the human body. Human anatomy; Anatomy. 136 ARTHROLOGT. Fig. 69. u /7. Acromio-clavicular Articulation (fig. 69). Articular Surfaces.—The clavicle and the acromion process oppose to each other a plane, elliptical surface, with its greatest diameter directed from before backward. The articular surface of the clavicle looks somewhat obliquely downward and outward, the acromial facette looks obliquely upward and inward. The extent of these surfaces va- ries greatly in individual cases, dependant on the degree of exercise to which the joint is subjected.* Means of Union and Provision for facilitating Motion.—These are, 1. An inter-articular cartilage, first pointed out by Weitbrecht; it is by no means constant, and, when it does exist, occupies only the upper half of the articulation. 2. An orbicular fibrous capsule (d, fig. 69), which is very thick above and behind, and very thin below. It is composed of distinct bundles, which are much longer behind than in front, and are strengthened by some fibres belonging to the aponeurosis of the trapezius muscle ; it is not only attached to the upper edge of the articular surface, but also to some inequalities upon the upper surface of the acromion. It is composed of several layers, the deepest being the shortest. 3. A synovial membrane, of a very simple construction, supported below by adipose tissue. Coraco-clavicular Articulation {fig. 69). There can be no doubt concerning the existence of an articulation, where two surfaces are contiguous, and capable of a gliding motion on each other ; one of them, the coracoid, being almost always covered with carti- lage and a synovial membrane ; and the other, the clavicular, presenting some- times a considerable process for this ar- ticulation. The means of union are two ligaments, or, rather, two distinct ligamentous bun- dles, a posterior and an anterior : they are called coraco-clavicular. 1. The posterior ligament, named also the conoid or radiated (c, fig. 69),
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