7 '//A 77fO/\'.l\. 



199 



1 )issect the following structures and study them carefully: 



1. The subclavius muscle and the costo-clavicular ligament. 



2. The external intercostal muscles and their fascia.'. 



3. The internal intercostal muscles and their fasci.r. 



4. The intercostal fascia.-, internal, middle, and external. 



FOR FIRST RIB 



An interarticular 

 ligament 



The plate of flbro- 

 cartilage between 

 manubrium and 

 meao-Bternum 



SEVENTH RIB 



FIG. 139. THE STKRM \i. 

 (Left side, showing ligaments ; right side, the synovia! cavities.) 



5. The anterior chondro-sternal ligaments. 



6. The anterior common sternal ligament of periostea! derivation. 



7. The scalenus anticus, inserted into the scalene tubercle of the first rib. 



8. The scalenus medius, inserted into the scalene depression of the first rib. 



9. The subclavian groove, between the scaleni muscles on the first rib. 

 10. The groove for subclavian vein on the outer surface of the first rib. 



