164 



ARTICULATIONS OF THE LOWER LIMB. 



Fk. 14S. 



"^^^^ 



Fig. l^S — Transverse Oblique Section of the Pelvis anp Hip- Joint, cutting the 

 riiisT Sacral Veuterra and the Symphysis Pubis in their middle, from a Male 

 Subject of about nineteen years of age. (A. T.) ^ 



1, tlie first sacral vertelira ; 2, the divided ilium ; 3, the posterior sacro-iliac liga- 

 ments ; 4, 4, the sacro-iliac synchondrosis, with a slight sei)aration between the two 

 jjlates of cartilage ; 5, the anterior sacro-iliac ligament ; 6, the lesser sacro-sciatic 

 ligament ; 7, greater sacro-sciatic ligament ; 8, placed in front of the symijhysis pubis, 

 in the cut surface of which the small median cavity, the adjacent fil)ro-cartilaglnoiis 

 jdates, and the anterior and posterior ligamentous fibres arc shown ; 9, the lower part of 

 the obturator membrane ; lU, the cai-tilaginous surface of the cotyloid cavity, tlirough 

 the middle of which the incision passes transversely, dividing tlie round ligament and the 

 synovial fat of the depression ; 11, the cotyloid ligament ; 12, the round ligament con- 

 nected with the transverse part of the cotyloid ligament : 13, placed on the cut surface 

 of the head of the left femur near the depression where the round ligament is attached ; 

 14, 14', the upper and lower parts of the capsular ligament and synovial capsule. 



The cotyloid ligament forms a, thick fibro-carfcilaginons ring" round 

 the margin of the acetabukim, increasing the depth of its cavity, and 

 bridging over the deficiency in its border. Its external surtace is in 

 contact with the capsular ligament, the internal closely embraces the 

 head of the femur, and both are covered by the synovial membrane. 

 Its fibres do iiot run parallel to the circumference of the cotyloid cavity, 

 ])ut pass obliquely from without inwards over its margin, one extremity 

 being attached to the outer, the other to the inner surface. 



At the cotyloid notch the fibres of the ligament are continued from 



