hiatus

(hi-a'tus) [L. an aperture.] i. An aperture or fi ure, i. foramen. 3. Vulva, h. aor'tic us (BNA], aortic opening; the opening in the diaphragm bounded by the two crura, the vertebral column, and the middle arcuate ligament, through which pa the aorta, vena azygos major, and thoracic duct. h. can a'lis facial is IBNA], h. of facial canal, a slit-like opening in the superior (anterior) surface of the petrous portion of the temporal bone leading into the facial or Fallopian canal, h. Fallo'pii, h. of Fallopius, h. canal is facial is [BNA]. h. maxilla'ris IBNA], maxillary hiatus, the opening into the antrum of High more on the nasal surface of the superior maxilla, h. cesophage'us [BNA], esophageal opening; the opening in the diaphragm, between the central tendon and the hiatus aortic us, through which pa the esophagus and the two pneumogastric nerves, h. Bacra'lis[BNA], a gap at the lower end of the sacrum, exposing the spinal canal, due to failure of the laminee of the last sacral segment to coalesce, h. semiluna'ris [BNA], semilunar hiatus, deep, narrow groove in the external wall of the middle meatus of the nasal fo a, into which the antrum of High more and the middle ethmoid cells open. h. tend in'eus [BNA], the anterior opening of Hunter's canal. h. tend in'eus adducto'rius [BNA], femoral opening, an aperture in the tendon of insertion of the adductor minimus between the adductor tubercle and the upper part of the supra condylar ridge, through which pa the superficial femoral ve els.