cochlear canaliculus a small canal in the petrous part of the temporal bone that interconnects the scala tympani with the subarachnoid space; it houses the perilymphatic duct and a small vein. dental canaliculi minute channels in dentin, extending from the pulp cavity to the overlying cement and enamel.
Lung infarction. Lung infarction, death of one or more sections of lung tissue due to deprivation of an adequate blood supply. The section of dead tissue is called an infarct. The cessation or lessening of blood flow results ordinarily from an obstruction in a blood vessel that serves the lung.
Sometimes a broken rib punctures an artery and causes internal bleeding around the lung, which can cause shortness of breath. Rarely, a broken rib can cause a âpunctured lung,â or pneumothorax, in which the lung collapses and air enters the space around the lung. This can cause severe pain and shortness of breath. Occasionally, fluid or air collects outside the lung and squeezes the lung. This also can cause shortness of breath.