ANATOMY APPLIED TO MEDICINE 

 AND SURGERY. 



CHAPTER I. 



THE REGION OF THE CLAVICLE. 



ANATOMY. APPLICATION 



LANDMARKS. DISLOCATION. 



FUNCTIONS. FRACTURE. 



Anatomy. The clavicle is a long bone, and consists 

 of a shaft and two extremities. The shaft is somewhat 

 twisted on itself, and, when viewed from in front, presents 

 a double curvature. One curve corresponds to the inner 

 two-thirds of the bone, and is convex anteriorly ; whereas, 

 the other, representing the outer third, is concave anterior- 

 ly. The twist in the bone occurs about the junction of 

 these curves, since it is here that the cylindrical-shaped 

 inner portion with its three surfaces anterior, posterior 

 and inferior merges into the flattened, outer third with 

 its two surfaces 1 superior and inferior. The clavicle ar- 

 ticulates, externally, with the scapula at the acromio- 

 clavicular joint, and, internally, with the sternum, at the 

 sterno-clavicular joint. 



The acromio- clavicular j.oint is an arthrodial or gliding 

 joint ; has, only occasionally, an inter-articular fibre-car- 

 tilage, and is surrounded by a capsular ligament; while 

 the sterno-clavicular articulation, also arthrodial, has an 

 anterior and a posterior ligament (the former more lax 

 than the latter) ; an inter-clavicular, between the two 

 clavicles ; a rhomboid, between the clavicle and the carti- 

 lage of the first rib, and, lastly, an inter-articular fibro-car- 

 tilage. 



