ARTrCULATlONS OF THE SHOULDEK. 



24i 



Articulation of the Clavicle and Sternum, called Sterno-clavicular. 



The connexion of the clavicle and sternum resembles strongly 

 that of the lower jaw and temporal bone. A movable cartilage 

 is placed between the articulating surfaces, with a distinct syno- 

 vial capsule on each side of it, applied in the usual manner to 

 the corresponding surface of the clavicle and of the sternum. 

 Exterior to these capsules and the intervening cartilage, are 

 many ligamentous fibres, which are most numerous on the ante- 

 rior and posterior surfaces, but diverge from each other as they 

 proceed from the clavicle to the sternum, and are, therefore, 

 called Radiated Ligaments. 



There is a strong ligament called the Interclavicular, which 

 passes across the sternum internally, from one clavicle to the 

 other. 



And another ligament, which arises from the inferior rough 

 surface of the clavicle, near the sternum, which is inserted into 

 the cartilage of the first rib. 



This is called the Rhomboid, or Costo-clavicidar ligament. 



Fig. 54.* 



Articulations of the Clavicle and Scapula, (^Scapulo-clavicular.) 



These are two in number ; 

 one which connects the acro- 



mion and external end of the 

 clavicle called acromio-clavicu- 

 lar, and one which connects 

 the lower surface of the outer 

 part of the clavicle with the 

 coracoid process of the scapula, 

 called coraco-clavicular. 

 Acromio-clavicular. The small surfaces of the clavicle and 

 scapula, which are in contact with each other, are furnished 



* The ligaments of the sterno-clavicular and costo-sternal articulations. 1. 

 The anterior sterno-clavicular ligament. 2. The inter-clavicular ligament. 3. 

 The costo-clavicular or rhomboid ligament, seen on both sides. 4. The inter- 

 articular fibro-cartilage, brought into view by the removal of the anterior and 

 posterior ligaments. 5. The anterior costo-sternal ligaments of the first and 

 second ribs. 



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