A R T1CULA TIONS. LIGAMENTS. 



459 



They enter Alcock's canal, which is a delamination of the obturator fascia 

 strengthened by the falciform ligament, a special part of the greater sacro-sciatic 

 ligament. 



2 2 



1 



FIG. 330. COCCYX, ANTERIOR ASPECT. 



I. Base. 2, 2. Cornua. 3. Second coccygeal vertebra. 4. Third coccygeal vertebra. 5. Fourth coc- 

 cygeal vertebra. 6. Fifth coccygeal vertebra. 



Fie';. 331. VERTEBRAL COLUMN, LATERAL ASPHT. 



1-7. Cervical vertebrae. 8-19. Dorsal vertel>ne. 20-24. Lumbar vertebra'. A, A. Spinous processes. 

 B, B. Articular facets of transverse processes of first ten dorsal vertebras. C. Auricular surface of 

 sacrum. I). Foramina in transverse processes of cervical vertebrae. 



The Sacro-coccygeal Articulation and Ligaments : 



1 . Class. Amphiarthrosis, bones united by cartilage. 



2. Osteological Units. The sacrum and coccyx. 



3. Subdivisio nal Parts. Sacral and coccygeal cornua. 



4. Nerve-supply. The fourth, fifth sacral, and coccygeal nerves. 



