120 HUMAN ANATOMY. 



The outlet of the pelvis is bounded by three prominences, the 

 tuber ischii laterally and the coccyx behind; separated by three 

 notches, the subpubic arch in front and the sacro-sciatic notches 

 posteriorly. 



Its principal diameters are : transverse, three and a half in 

 male, four and three-fourths in female; antero-posterior and 

 oblique, three and one-fourth in male, five in female. 



In the erect position the pelvis is placed at an angle of from 

 sixty degrees to sixty-five degrees with the ground. 



DIFFERENCES OF SEX. The male pelvis is characterized by 

 the strength of the bones, by prominent muscular impressions, 

 by the depth and narrowness of the cavity, the large obturator 

 foramen, and the acute angle of the subpubic arch. 



The female pelvis is characterized by the lightness of the 

 bones, the slight muscular impressions, by the shallow expanded 

 iliac fossae, the increased size of the cavity in every diameter, and 

 the obtuse angle of the subpubic arch. 



ARTICULATIONS OF THE UPPER EXTREMITY. 



The sterno-clavicular articulation is an arthrodial joint, 

 formed between the sternal end of the clavicle and the sternum 

 and first rib, being divided into two cavities by an interarticular 

 fibro-cartilage. Its ligaments are : 



Anterior sterno-clavicular , is a broad band passing between 

 the articular margins, attached to the interarticular cartilage 

 and two synovial membranes, and forming the front part of the 

 capsular ligament; 



Posterior sterno-clavicular, passes over the posterior aspect 

 of the joint and corresponds to the former; 



Inter clavicular., passes from the sternal end of the clavicle 

 on one side across the supra-sternal notch to the clavicle of the 

 opposite side; 



Costo-clavicular, or rhomboid, passes from the rhomboid 

 impression on the inferior surface of the clavicle to the upper sur- 

 face of the first costal cartilage. 



The synovial membranes form two sacs separated by the in- 

 terarticular cartilage. 



' The arteries are from muscular branch of supra-scapular 

 and contiguous muscular branches; 



The nerves, from descendens noni. 



ACROMIO-CLAVICULAR ARTICULATION is an arthroidal joint 

 formed between the acromial extremity of the clavicle and the 

 acromial process of the scapula. Its ligaments are: 



