AND PHYSIOLOGY. 



11 



Fig. SI. 



A Lateral View of the Ligaments of the Hip- 

 Joint and Pelvis. 1, The Posterior Sacro-Iliac 

 Ligament of the Pelvis. 2, The greater Sacro- 

 Sciatie Ligament. 3, The Lesser Sacro-Sciatic 

 Ligament. 4, The Greater Saero-Sciatic Notch, 

 ft, The Lesser Sacro-Sciatic Notch. 6, The Co- 

 tyloid Ligament around the Acetabulum. 7, 

 The Ligamentum Teres. 8, The Line of At- 

 tachment of the Capsular Ligament of the Hip- 

 Joint, posteriorly. The Ligament has been 

 removed, in order to show the Joint. 9, The 

 Obturator Ligament. 



The Eight Knee-Joint laid open. 

 1, The Lower End of the Femur cov- 

 ered by its Articular Cartilage. 2, The 

 Anterior Crucial Ligament. 3, The 

 Posterior Crucial Ligament. 4, The 

 Transverse Fasciculus adhering to 

 the Semilunar Cartilages. 5, The 

 Point of Attachment of the Ligamen- 

 tum Mucosum,the rest of it has been 

 removed. G, The Internal Semilunar 

 Cartilage. 7, The External Semilunar 

 Cartilage. 8, A part of the Ligamen- 

 tum Patellae turned downwards. 9, 

 Its Bursa laid open. 10, The Supe- 

 rior Peroneo-Tibial Articulation. 11, 

 The Interosseous Ligament. 



160. Aid of Atmospheric Pressure. — Atmospheric pres- 

 sure also helps to keep the bones together. For since the 

 projection of one member so accurately fits the depression in 

 the other, and as the lubricating fluid makes the coupling 

 most perfect, the pressure of the atmosphere assists not a 

 little to keep the parts together. 



161. Inter-articular Cartilage. — Another arrangement in 

 the joints is not a little singular, and well adapted to its pur- 

 pose. This is an interarticular cartilage in the knee called 

 semilunar, or a small disc of cartilage which lies loosely be- 



160. What besides the ligaments helps to keep the bones together ? 161, Describe the 

 interarticular cartilage and its use. 



