45 6 



PRACTICAL ANATOMY. 



Symphysis Pubis : 



Class. Amphiarthrosis, because of union by cartilage and slight motion. 



Osteological Elements. The bodies of the two pubic bones. 



Ligaments. Anterior, posterior, superior, inferior, and interosseous cartilage. 



Is there anv difference betide en this joint in tlie two sexes? 



The joint is shorter and broader in the female than in the male. (Fig. 324.) 



Is tlie nerve-supply of the symphysis pubis well understood .' 



No ; but it probably is derived from the ilio-inguinal, ilio-hypogastric, and 



internal pudic nerves. 



From wliat source does this articulation derive its blood-supply / 



From the internal pudic, the obturator, deep epigastric, internal circumflex, 



iliac, and external pudic arteries. 



Foramen for last 



lumbar nerve 

 Intervertebral body 

 between last lum- 

 bar and first sacra) 

 vertebrae 



Foramen for anterior primary branch of fourth 

 lumbar nerve 



The ilio-lumbar 

 ligament 



The sacro-lumbar 

 ligament 



Superior sacro-iliac 

 ligament 



Anterior sacro-iliae 

 ligament 



Great sacro-Boiatio 

 ligament 



Leaser sacro-sciatic 

 ligament 



FIG. 327. ANTERIOR VIEW OF THE PELVIS. 



What influence has prc^nancr on tlie interosscons cartilage between the pubic 

 bones ? 



The cartilage becomes softer and the blood-supply more abundant. 



Is there any special difference in tlie interosscons cartilage in (lie male and 

 female t 



It is thicker in the female than in the male. 



What is sympkysotomy or symphysiotomy ' 



Cutting through the pubic symphysis to increase the conjugate diameters of 

 the pelvic canal. In this obstetric operation all the ligaments of the symphysis 

 pubis are cut. 



Sacro-iliac Articulation and Its Ligaments : 



Class. Amphiarthrosis, bones united by cartilage and slight motion. 



