4 68 



PRACTICAL ANATOMY. 



6. Nerve-supply. Anterior division of the suboccipital nerve. 



7. Blood-supply. The vertebral and ascending pharyngeal arteries. 



8. Ligaments of Atlanta-occipital Articulation. (i) Anterior occipito-atlantal ; 

 (2) posterior occipito-atlantal ; (3) two capsular ; (4) two anterior oblique. 



THE OCCIPITO-AXOID ARTICULATION AND LIGAMENTS. 



1. The occipito-cervical. 



2. The crucial. 



3. Two lateral odontoid or check. 



4. The central odontoid or suspensory. 



For detailed description of these ligaments the student is referred to 

 " Morris' Anatomy." 



Atlanto-axoid- 

 ean capsular 

 ligament 





Ocoipito-oervi- 

 cal ligament, 

 i. e., the deep 

 stratum of the 

 posterior com- 

 mon vertebral 

 ligament 



process of atlas 



FIG. 342. THE SUPERFICIAL LAYER OF THE POSTERIOR COMMON VERTEBRAL LIGAMENT HAS KEEN 

 REMOVED TO SHOW ITS DEEP OR SHORT FlBRKS. THESE DEEP FIBRES FORM THE OcClPITO- 

 CERVICAI. LIGAMENT. 



ARTICULATION OF THE RIBS WITH THE VERTEBRA;. 



1 . Class. Diarthrosis, because of free movement, and a capsule. 



2. Subdivision. Condylarthrosis, because of no axial rotation. 



3. Osteological Units. Vertebras and ribs. 



4. Subdivisions. Head and tubercle of rib ; body and transverse process. 



5. Technical Names. Costocentral joints; costotransverse joints. 



6. Basis of Joint. A capsule lined by a synovial membrane. 



THE BONY THORAX AND ITS INTRINSIC LIGAMENTS. 



The bony thorax, plus certain soft parts, as ligaments, fasciae, muscles, and 

 skin, is a cavity for the protection of the major organs of respiration and circu- 

 lation. Geometrical analysis of the thorax shows it to have : 



i. An apex, formed by the manubrium, first rib, first thoracic vertebra. 



