LIGAMENTS OP THE PELVIS, ETC. 249 



and also into the external cuneiform bone; a sesamoid 

 bone is usually found in its tendon. 



The tendon of the peroneus longus (p. 244) passes ob- 

 liquely across the foot to the base of the metatarsal bone 

 of the great toe, into which it is inserted ; as it turns round 

 the cuboid bone its tendon becomes thickened and fibro- 

 cartilaginous, and sometimes contains a sesamoid bone ; it 

 is enveloped with a sheath formed by the ligaments of the 

 tarsal bones, and lined by a synovial membrane. 



DISSECTION XIV. 



LIGAMENTS OF THE PELVIS AND LOWER EXTREMITY. 



The pelvis is connected with the vertebral column by 

 ligaments similar to those uniting one vertebra to another, 

 with the addition of two special ligaments, the lumbo- 

 sacral and the ilio-lumbar. 



The lumbo-sacral ligament is a stout, triangular bundle 

 )f fibres springing from the tip of the transverse process 

 >f the last lumbar vertebra, and expanding, fan-shaped, to 

 >e inserted into the posterior part of the upper border of 

 jhe sacrum. 



The ilio-lumbar ligament extends between the tip of the 

 transverse process of the last lumbar vertebra and the crest 

 of the ilium, just above the sacro-iliac articulation. 



The sacrum and the coccyx are united by an anterior 

 and posterior common ligament, and by intervening fibro- 

 cartilaginous dixks; in adults, the bones are, however, 

 usually co-ossified. 



The sacrum and ilium are united by cartilage, and by 

 anterior and posterior sacro-iliac ligaments, at the sacro- 

 iliac synchondrosis, and by the sacro-ischiatic ligaments 

 inferiorly. 



The anterior sacro-iliac ligament is a transverse band of 

 fibres covering the anterior aspect of the articulation. 



The posterior sacro-iliac ligament is composed of stout 

 bundles of fibres passing between the first two bones of the 

 sacrum and the rough surface at the posterior border of the 

 ilium. 



The greater sacro-ischiatic ligament passes from the side 

 of the sacrum and coccyx to the tuberosity of the ischiurn. 



