Anatomy Lab 8

Skeleton - Axial - Throacic cage - sternum; is a result of the manubrium and body meeting at a slight angle to each other, so that a transverse ridge is formed at the level of the second ribs. Provides a handy reference point for counting ribs to locate the second intercostal space for listening to certain heart vlaves, and is an important anatomical landmark for thoracic surgery. 

Skeleton - Axial - Throacic cage - sternum; the point where the sternal body and xiphoid process fuse, lies at the level of the ninth thoracic vertebra. 

Skeleton - Axial - Throacic cage - ribs; 12 pairs of bones that form the walls of the thoracic cage. 

Via their heads and tubercles and then curve downward and toward the anterior body surface. 

The first seven pairs of ribs called true or vertebrosternal attach directly to the sternum by their own coast cartilages. 

The inferior set of five ribs, they attach indirectly to the sternum or entirely lack a sternal attachment. Of these, rib pairs 8 - 10 which are also know as vertebrochondral ribs, have indirect carilage attachments to the sternum via the costal cartiladge of rib 7.