372 SURGICAL APPLIED AN ATOMS, [ciup. xvm. 



^he duct is said to have been injured by a bullet 

 that entered just below the left scapula, since from 

 the wound in the integuments large quantities of 

 lymph escaped freely. The duct has been found to 

 have been obliterated, and that, too, without pro- 

 ducing any marked symptoms during life. 



CHAPTER XVIII. 



THE PELVIS AND PERINEUM. 



THE mechanism of the pelvis. Besides 

 forming a cavity for certain viscera, a support for 

 some abdominal organs, and a point for the attachment 

 of the lower limb, and of many muscles, the pelvis 

 serves to transmit the weight of the body both in the 

 standing and sitting postures. The transmission is 

 effected through two arches, one available for the 

 erect position, the other for the posture when sitting. 

 The sacrum which supports the spinal column is the 

 centre or keystone of both these arches. When stand- 

 ing, the arch is represented by the sacrum, the sacro- 

 iliac synchondroses, the ace tabula, and the masses of 

 bone extending between the two last-named points. If 

 all other parts of the pelvis were to be cut away but 

 these, the portions left would still be able to support 

 the weight of the body, and would represent in its 

 simplicity the arch through which that weight is 

 transmitted. When sitting the arch is represented by 

 the sacrum, the sacro-iliac synchondroses, the tubera 

 ischii, and the strong masses of bone that extend 

 between the two last-named parts. Morris terms 

 these two arches the femoro-sacral and the ischio- 

 sacral. On examining the innominate bone it will 



