118 HUMAN ANATOMY. 



An anterior sacro-coccygeal ligament, and 



A posterior sacro-coccygeal ligament, continuations respect- 

 ively of the anterior and posterior common ligaments. 



Lateral sacro-coccygeal, intertransverse, and intercornual 

 ligaments connecting the rudimentary transverse processes and 

 the cornua together. 



The arteries are from lateral and median sacral; 



The nerve branches of coccygeal, fifth sacral, and posterior 

 divisions of fourth sacral. 



PUBIC ARTICULATION. This is an amphiarthrodial joint, 

 known also as the sympliysis pubis. 



It is connected by the 



Anterior pubic ligament in front; 



FIG. 89. 



A A, antero-posterior diameter; B B, transverse diameter; C C, 

 oblique diameter; 1, sacro-iliac ligament; 2, anterior or lesser sacro- 

 sciatic ligament; 3, posterior or great sacro-sciatic ligament. 



Superior pubic ligament above; 



Posterior pubic ligament behind ; 



Subpubic ligament below, forming the boundary of the pubic 

 arch. 



Within the joint an interposed fibro-cartilage separates the 

 bones. 



The obturator membrane, or ligament, closes the obturator 

 foramen, and affords attachment for the external and internal 

 obturator muscles and allows passage at its upper outer part, for 



the obturator vessels and nerves. 







THE PELVIS. 



The pelvis is a strong, bony basin, formed at the lower end 

 of the vertebral column by the articulation of the sacrum and 

 coccyx posteriorly with the ossa innominata laterally. 



