4 68 



PRACTICAL ANATOMY. 



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



7. Blood-supply. The vertebral and ascending pbaiyngeal 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 



Occipito-carvl- 

 cal ligament, 

 i.e., the deep 

 stratum of the 

 posterior com- 

 mon vertebral 

 ligament 



Transverse process of atlas 



FIG. 342. THE SUPERFICIAL LAYER OF THE POSTERIOR COMMON VERTEBRAL LIGAMENT HAS I-I-.KN 

 REMOVED TO SHOW ITS DEEP OR SHORT P'lBRES. THESE DEEP FIBRES FORM THE OCC1PITO- 

 CERVICAL LIGAMENT. 



ARTICULATION OF THE Rius WITH THE VERTEBR.I . 



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



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



3. Osteological Units. Vertebrae and ribs. 



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



5. Tcclinical Xanics. Costocentral joints ; costotransverse joints. 



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



Tin. BONY THORAX AND ITS INTRINSIC LIGAMENTS. 



The bony thorax, plus certain soft parts, as ligaments, fascia-, 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 'f/V.r, formed by the manubrium, first rib, first thoracic vertebra. 



