1G2 



ARTICULATIONS OF THE PELVIS. 



terior roupjh portion of the lateral surface of the Sacrum and that part 

 of the ilium which projects beyond the dorsum of the sacrum. A 

 superficial band extending downAvards from the posterior superior 

 iliac spine to the third or fourth piece of the sacrum, in a direction 

 different from the other fibres, is distinguished as the oll'uiue sacro-iUac 

 ligament. 



The anterior sacro-iliac ligament consists of thin irregular fibres 

 passing between the sacrum and os iunominatum on tlicir pelvic 

 surfaces. 



The sacro-sciatic ligaments. — The posterior, or great sacro- 

 sciatic ligament, broad and triangular, assists in closing tlie lower aper- 

 ture of the pelvis. Its base is attached to the postero-ini'erior iliac spine 

 and to the side of the sacrum and coccyx ; whilst its apex is fixed along 

 the inner surface of the ischial tuberosity, where it expands somewhat, 

 and sends upwards and forwards along the margin of the ischial ramus 

 a falciform ]yroces>^, the border of which is continuous with, and ibrms tlie 

 inferior attachment of, the obtarator fascia. 



The anterior, or small sacro-sciatic ligament, much shorter 

 and thinner than the preceding one, in front of which it lies, is also 

 triangular in form, and is attached by its base to the side of the^acruni 

 and coccyx, where its fibres are blended with those of the great liga- 

 ment ; and, by its apex, to the _£pine of the ischium. 



Foramina. Between the upper border of the great sacro-sciatic 

 ligament and the innominate bone, is a large space subdivided by the 

 small sacro-sciatic ligament. The part w'hich lies above this ligament 

 is a large oval opening, named the great sacro-sciatic foramen. It 

 transmits the pyriform muscle and the gluteal and sciatic vessels and 

 nerves. The part between the greater and lesser sacro-sciatic liga- 



Fi-. 1:17. 



Fig. 147. — Right half of a Female 

 Pelvis, seen from the inner side. 

 (A. T.) ? 



1, supraspinous ligaments descend- 

 ing to the sacrum from 2, 2, the 

 lumbar spinous processes ; '-i, 4, the 

 lumbar and sacral spinal canal, with 

 its i)eriosteal lining ; 5, placed on 

 the ilium above the anterior sacro- 

 iliac ligament ; 6, placed in the great 

 saci'o-sciatic foramen, jioiuts to the 

 lesser sacro-sciatic ligament ; 7, greater 

 sacro-sciatic ligament, with 7', its con- 

 tinuation over the inner border of the 

 tuberosity of the ischium ; S, a jjortion 

 of the wall of the cotyloid cavity, re- 

 moved so as to give a view from the 

 inside of the head of the femur ; 9, the 

 round ligament put upon the stretch, 

 the femur being jjartially flexed and 

 adducted ; 10, the inner part of the 

 capsular ligament relaxed ; 11, the 

 shaft of the femur. 



ments, much smaller in size, 

 and bounded in front by the 

 smooth surface between the 

 spine and tuberosity of the ischium? is the small sacro-sciatic foramen, 



