OF PELVIS WITH THE SPLXE 



199 



accessory ligaments on either side, viz. the sacro-lumbar and the iHo-lumbar, con- 

 nect the pelvis with the fourth and fifth lumbar vertebrae. 



Tlie sacro-lumbar ligament (fig. 206) is .strong, and triangular in shape. Its 

 ai)ex is above and internal, being attached to the whole of the lower border and 

 front surface of the transverse process of the fifth lumbar vertebra, as well as to the 

 pedicle and body. It is intimately blended with the ilio-lumbar ligament. Below, it 

 has a wide fan-shaped attachment, extending from the edge of the ilio-lumbar liga- 

 ment forwards to the brim of the true pelvis; blending with the periosteum on tlie 

 base of the sacrum and in the iliac fossa, and with the superior sacro-iliac liga- 

 ment. By its sharp internal border it limits externally the foramen for the lad 

 lumbar nerve. It is pierced by two large foramina, which transmit arteries to the 

 sacro-iliac synchondrosis. This ligament is in series with the intertransverse 

 ligaments of the^pinal column. 



Fig. 2(16. — Axtkkiok View of thk Lh;amexts between the .Spixe axd Pelvi.s. 



Foramen for last 

 lumbar nerve 

 Intervertebral body 

 between last lum- 

 bar and first sacral 

 vertebra 



mary branch of fourth 



The ilio-lumbar 

 ligament 



The sacro-lumbar 

 ligament 



Superior sacro-iliac 

 ligament 



Anterior sacro-iliac 

 ligament 



Great sacro-sciatic 

 ligament 



Lesser saero-seiatic 

 ligament 



The ilio-lumbar ligament (tig. 206) is a strong, dense, triangular ligament, 

 which springs from the front surface of the transverse process of the fifth luml>ar 

 \ei'tebra as far as the body, by a strong fasciculus from the posterior surface of the 

 ]irocess near the tip, and also from the front surface and lower edge of the trans- 

 verse process and pedicle of the fourth lumbar verteljra, as far inwards as the body. 

 Betiveen (lie--<e turj lumbar vertebrx it is inseparable from the intertran.^rer.se ligament. At 

 its origin from the transverse process of the fifth lumbar vertebra, it is closely 

 interwoven with the sacro-lumbar ligament, and some of its fibres spread down- 

 wards on to the body of the fifth vertebra, while others ascend to the disc above. 



At the pelvis it is attached to the inner lip of the crest of the ilium for about 

 two inches (5 cm. ). The highest fibres at the spine form the upper edge of the 

 ligament at the ]>elvis. those which come from the posterior i)Ortion of the trans- 

 verse process of the fifth lumbar vertebra forming the lower, while the fibres from 

 the front of the same process pass nearly horizontally outwards. 



