Assertion: trachea's surface | /r/CapableOf | face toward the diaphragm
Facets:
value: downward
type: MANNER
Source sentences:
text: Each lung has a costal surface, which is adjacent to the ribcage; a diaphragmatic surface, which faces downward toward the diaphragm; and a mediastinal surface, which faces toward the center of the chest, and lies against the heart, great vessels, and the carina where the two mainstem bronchi branch off from the base of the trachea.