Category: O

A communicating tract between the oral cavity and the maxillary sinus, occasionally resulting from the extraction of the first or second molar. It may become infected. Treatment varies with the size of the defect. Small lesions heal spontaneously; larger ones may be repaired with flap surgery or with prostheses.  

A complication of excessively prolonged labor and childbirth in which the blood supply to the vagina is interrupted, leading to tissue death and the development of a tract between the vagina and the large bowel or the urinary bladder.  

The fissure between the occipital and parietal lobes of the brain.  

A device that passes only a portion of the visible light spectrum. Absorption filters absorb the unwanted wavelengths. Interference filters employ the wave effects of constructive and destructive superposition to pass or inhibit appropriate wavelengths.  

Bundles of thin, acid-resistant fibrils found in the periodontium.  

Formation of oxalic acid from carbohydrates by the action of certain molds, especially Aspergillus.  

An RBC that stains with acid stains only, the cytoplasm appearing pink.  

An enzyme that catalyzes oxidative reactions.  

An oval projection at the upper part of the medulla oblongata above the extremity of the lateral column.  

An electrode invented by Dr. Leland Clark, used to measure the partial pressure of oxygen (Po2), usually in arterial blood (blood gas).