THE HIP-JOINT. 



151 



owes the principal increase of its dimensions in parturition to the same cause. (See 

 Wood, article " Pelvis " in " Cyclopaed. of Anat. and Physiol ; " Zaglas, in " Monthly 

 Journ. of Med. Science," 1851 ; J. AL Duncan, in " Dublin Quart. Journ. of Med. 

 Science/' 1854, and " Edin. Med. Journ.," 1855 ; Struthers, " Anat. Observ.") 



ARTICULATIONS OF THE LOWER LIMB. 



THE HIP- JOINT. 



This is a large ball-and-socket joint, in which the globular head of the 

 femur is received into the acetabulum or cotyloid cavity of the innominate 



Fig. 139. 



Fig. 139. TRANSVERSE OBLIQUE SECTION OP THE PELVIS AND HIP-JOINT, CUTTING TIJK 

 FIRST SACRAL VERTEBRA AND THE SYMPHYSIS PUBIS IN THEIR MIDDLE, FROM A MALK 

 SUBJECT OF ABOUT NINETEEN YEARS OF AGE. 



1, placed above the middle of the cut surface of the first sacral vertebra, and between 

 the divided superior articular processes ; 2, the divided ilium ; 3, the posterior sacro- 

 iliac ligaments also divided ; 4, 4, the sacro-iliac synchondrosis, with a slight separation 

 between the two plates of cartilage ; 5, the anterior sacro-iliac ligament; 6, the anterior 

 or short sacro-sciatic ligament ; 7, a portion of the posterior or long sacro-sciatic ligament ; 

 8, placed in front of the symphysis pubis, in the cut surface of which the small median 

 cavity, the adjacent fibro-cartilaginous plates and the anterior and posterior ligamentous 

 fibres are shown; .9, the lower part of the obturator membrane; 10, placed on the 

 cartilaginous surface of the cotyloid cavity of the right side, through the middle of which 

 the incision passes transversely and divides the round ligament and the synovial fat of 

 the depression; 11, the cotyloid ligament or fibrous border; 12, the round ligament of 

 the left side, where it is connected 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. 



