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antrum[an´trum] (pl. an´tra, antrums) (L.)
a cavity or chamber. adj., adj an´tral.
antrum of Highmore maxillary sinus.
mastoid antrum an air space in the mastoid portion of the temporal bone communicating with the middle ear and the mastoid cells.
antrum maxilla´re (maxillary antrum) maxillary sinus.
pyloric antrum (antrum pylo´ricum) the proximal, expanded portion of the pyloric part of the stomach.
tympanic antrum (antrum tympa´nicum) mastoid antrum.
the initial portion of the pyloric part of the stomach, which may temporarily become partially or completely shut off from the remainder of the stomach during digestion by peristaltic contraction of the prepyloric "sphincter"; it is sometimes demarcated from the second part of the pyloric part of the stomach (pyloric canal) by a slight groove.
that part of the stomach between the pyloric canal and the body of the stomach.
py·lor·ic an·trum(pī-lōr'ik an'trŭm) [TA]
The initial portion of the pyloric part of the stomach, which may temporarily become partially or completely shut off from the remainder of the stomach during digestion by peristaltic contraction of the prepyloric "sphincter"; it is sometimes demarcated from the second part of the pyloric part of the stomach (pyloric canal) by a slight groove.
Synonym(s): antrum (2) .
Synonym(s): antrum (2) .
pertaining to the pylorus or to the pyloric part of the stomach.
antral pyloric hypertrophy syndrome
a narrowing of the pyloric antrum caused by hypertrophy of the circular smooth muscle and mucosa; occurs most commonly in dogs of small breeds. Obstruction to gastric emptying causes chronic vomiting.
the part of the stomach cavity just cranial to the pylorus.
the usual effect is to delay gastric emptying. See pyloric achalasia, pyloric obstruction (below).
chronic hypertrophic pyloric gastropathy.
situated in the pyloric region of the stomach and secreting gastrin and mucus. The secretion is slightly alkaline.
may be functional due to spasm or achalasia, or physical due to foreign body, e.g. phytobezoar, or external compression by, e.g. lipoma or fat necrosis or tumor or cicatrical contraction. Clinical signs are vomiting, distress due to gastric dilatation, possibly visible abdominal enlargement. In ruminants gross distention of abdomen, rumen contents running from nose, scant feces. In dogs and cats delayed gastric emptying usually causes vomiting, sometimes characteristically projectile, of undigested food.
pyloric outflow failure
achalasia of the pylorus with obstruction to the flow of ingesta into the intestine; impaction of material in the abomasum follows; pyloric ulcer a common sequel.
see pyloric achalasia (above).
pyloric stenosis, congenital pyloric hypertrophy
usually a congenital lesion in dogs, particularly the brachycephalic breeds, that causes vomiting and poor growth from weaning age. Occasionally hypertrophy of the pyloric sphincter may be acquired.