The TracheaPosition: extends fromthe lower border ofcricoid cartilage to thelevel of sternal angle(betweenT4－T5vertebrae)where itdivides into right andleft principal bronchi
The Trachea ◼ Position: extends from the lower border of cricoid cartilage to the level of sternal angle (between T4－T5 vertebrae) where it divides into right and left principal bronchi
StructurefeaturesConsists of about 1620 C-shaped incompletetracheal cartilages for patency connected bysmoothmuscle and connectiveCarinaof trachea ridge of cartilage atbifurcation into principal bronchi
◼ Structure features Consists of about 16－20 C-shaped incomplete tracheal cartilages for patency connected by smooth muscle and connective Carina of trachea －ridge of cartilage at bifurcation into principal bronchi
BronchiRight principal bronchusShorter, wider, and morevertical than the left , is about2.5cm long, Leaves theextend line of the middle lineof trachea at 22～25° angleForeign bodies are thereforemore likely to lodge in thisbronchus or one of itsbranches
Bronchi Right principal bronchus ◼ Shorter, wider, and more vertical than the left , is about 2.5cm long, Leaves the extend line of the middle line of trachea at 22～25o angle ◼ Foreign bodies are therefore more likely to lodge in this bronchus or one of its branches
Leftprincipalbronchus Narrower, longer, and more horizontal than theright is about 5cm long, leaves the extend line ofthemiddleline o trachea atabout 35~36 angle
Left principal bronchus ◼ Narrower, longer, and more horizontal than the right is about 5cm long, leaves the extend line of the middle line o trachea at about 35～36o angle
At the approximate level of the sternal angle, thetrachea bifurcates or splits, into the right and leftprimary (1°)bronchi.Each bronchusruns freely fora viewcentimeters, then enters its respective lungAir is conducted through the primary bronchiinto and out of each lung
◼ At the approximate level of the sternal angle, the trachea bifurcates or splits, into the right and left primary (1°) bronchi. ◼ Each bronchus runs freely for a view centimeters, then enters its respective lung. ◼ Air is conducted through the primary bronchi into and out of each lung