The trachea

The trachea commences in the neck at the level of the lower border of the cricoid cartilage (C6) and runs vertically downwards to end at the level of the sternal angle of Louis (T4/5), just to the right of the mid-line, by dividing to form the right and left main bronchi. In the erect position and in full inspiration the level of bifurcation is at T6.

Level Lower Border The Lung
Fig. 1 Lateral view of the thorax—its surface markings and vertebral levels. (Note that the angle of Louis (T4/5) demarcates the superior mediastinum, the upper margin of the heart and the beginning and end of the aortic arch.)
Angle Louis
Fig. 2 The surface markings of the lungs and pleura—anterior view.

Surface anatomy and surface markings

Fig. 3 The surface markings of the lungs and pleura—posterior

Fig. 3 The surface markings of the lungs and pleura—posterior

Angle Louis
Fig. 4 The surface markings of the heart (see text).
Heart Surface Markings
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Responses

  • BERYLLA
    What is angle of louis?
    7 years ago

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