ARTICULA TIONS. LIGAMENTS. 



Ligaments. Laterals, dorsals, and glenoids. 



Ligamentous Muscles. Flexors and extensors of the digits. 



Nerve-supply. Internal and external plantar nerves. 



453 



FIG. 321. RIGHT INNOMINATE BONE, EXTERNAL ASPECT. 



Superior border, or crest. 2. Anterior superior iliac spine. 3. Posterior superior iliac spine. 4,4,4. 

 Superior curved line. 5,5- Inferior curved line. 6. Surface between inferior curved line and 

 acetabulum. 7. Anterior inferior iliac spine. 8. Anterior interspinous notch. 9. Posterior inferior 

 iliac spine. 10. Posterior interspinous notch. II. Spine of ischium. 12. Great sacro-sciatic notch. 

 13. Acetabulum. 14. Fundus of acetabulum. 15,15. Circumference of acetabulum. 16. Cotyloid 

 notch. 17. Spine of pubes. 18. Horizontal branch of pubes. 19. Descending branch of pubes. 

 20,20. Ischium. 21. Groove for tendon of obturator externus muscle. 22. Obturator foramen. 



P. LAC. it E.SAL. 



FIG. 322. PELVIS, ANTEKO SUPKKIOR VIEW, SUPERIOR STRAIT. 



1,1. Internal iliac fossae. 2,2. Iliac crests. 3,3- Anterior superior iliac spines. 4,4. Anterior inferior 

 iliac spines. 5,5. Ilio-pectineal eminences. 6,6. Horizontal branches of pubes. 7.7. Bodies and 

 symphysis of pubes. 8, 8. Acetabula. 9, 9. Tuberosities of iscbia. 10, 10. Ascending rami of 

 ischium. II, II. Descending rami of pubes. 12, 12. Spines of ischia. 13, 13 Posterior wall of 

 pelvic cavity. 14, 14. Sacro-iliac symphyses. 15. Sacro-vertebral angle. 16, 16. Superior strait. 



THE PELVIS ITS ARTICULATIONS AND LIGAMENTS. 



The bones of the pelvis are the sacrum, coccyx, and ossa innominata. The 

 pelvis articulates with the lumbar part of the vertebral column, and with the 

 head of the femur. We m;iy then classify the articulations, for purposes of con- 

 venience, as (i) intrinsic, where the articulation is between pelvic bones ; (2) ex- 

 trinsic, where the articulation is between pelvic bones and bones not pelvic. 



