antrum
American Heritage Dictionary:
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an·trum
(ăn'trəm) 
n., pl., -tra (-trə).
n., pl., -tra (-trə).
- A cavity or chamber, especially one in a bone.
- Either of the sinuses in the bones of the upper jaw, opening into the nasal cavity.
[Late Latin, cavity in the body, from Latin, cave, from Greek antron.]
antral an'tral adj.
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(ăn'trəm)
n., pl. -tra (-trə).
n., pl. -tra (-trə).
- A nearly closed cavity or chamber, especially in a bone.
- The pyloric end of the stomach, partially shut off during digestion from the cardiac end by sphincter muscles in the stomach wall.
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Pertaining to the antrum; usually the reference is to the pyloric antrum of the stomach. See also pylorus.
- a. peristalsis — responsible for the onward movement of ingesta through the pylorus; when the pylorus is closed the movements assist in the mixing and maceration of the stomach contents.
Mosby's Dental Dictionary:
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antrum
(an′trum)
n
n
A maxillary sinus. A cavity in the maxilla, lined by ciliated columnar epithelium, the inferior border of which approximates the apices of the roots of the maxillary posterior teeth.
Wikipedia on Answers.com:
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Antrum
In biology, antrum is a general term for a cavity or chamber which may have specific meaning in reference to certain organs or sites in the body.
In vertebrates, it may mean for example:
- antrum cardiacum, a dilation that occurs in the esophagus near the stomach (forestomach)
- antrum follicularum, the cavity in the epithelium that envelops the oocyte
- mastoid antrum, a cavity between the middle ear and temporal bone in the skull
- pyloric antrum, the initial portion of the pyloric part of the stomach. This is what usually is referred to in terms of "antrum" in stomach related topics.
- maxillary antrum or Antrum of Highmore, the maxillary sinus, a cavity in the maxilla and the largest of the paranasal sinuses
In invertebrates, it may mean for example:
- antrum of female lepidoptera genitalia
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Copyrights:
American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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American Heritage Stedman's Medical Dictionary
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.
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Saunders Veterinary Dictionary
Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved.
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Mosby's Dental Dictionary
Mosby's Dental Dictionary. Copyright © 2004 by Elsevier, Inc. All rights reserved.
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