ad'it us

[L. way.] In anatomy, a structure serving as a means of approach or entrance to a part. a. ad an'trum, approach to the antrum, rece us epitympanicus. u. ad an'trum tympan'icum, rece us epitympanicus. a. ad aquseduc'tum cer'ebri, entrance to the aqueduct of. the cerebrum (of Sylvius), in the posterior part of the floor of the third ventricle, a. ad infundib'ulu in, rece us infundibuli. a. glot'tid is infe'rior, the part of the larynx immediately below the glottis, a. glot'tid is supe'rior, the lower portion of the ventricle of the larynx, a. larjrn'gis, the superior aperture of the larynx, bounded laterally by the ary epiglottic folds, a. or'bitse, orbital opening.