antrum
Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition
- noun A cavity or chamber, especially one in a bone.
- noun Either of the sinuses in the bones of the upper jaw, opening into the nasal cavity.
Examples
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The sensation of swallowing and food entering the stomach causes the antrum to produce gastrin.
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The stomach is made up of three parts, the fundus (base of a hollow organ, the part farthest from the opening), antrum (the cavity, the part adjoining the pylorus) and pylorus (the lower part of the stomach that leads to the duodenum).
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This chronic infection is initiated in the lower part of the stomach (antrum).
Press Release: The 2005 Nobel Prize in Physiology or Medicine
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“After two minutes, the leech moved slowly out of the antrum sinus and was retrieved with forceps,” the journal said.
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It was somewhat striking that I never observed any trouble, immediate or remote, from these perforations of the antrum.
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The tympanic antrum is bounded above by a thin plate of bone, the tegmen tympani, which separates it from the middle fossa of the base of the skull; below by the mastoid process; laterally by the squama just below the temporal line, and medially by the lateral semicircular canal of the internal ear which projects into its cavity.
Note
The word 'antrum' comes from a Greek word meaning 'cave'.
