Assertion: trachea | /r/CapableOf | become flattened
Facets:
value: dorsoventrally
type: DEGREE
Source sentences:
text: Contraction of this muscle can slightly alter the diameter of the lumen, but it does not change the luminal profile: the trachea maintains an almost circular lumen immediately caudal to the larynx, but becomes dorsoventrally flattened as it courses caudally.