a'triixm

[L. antechamber.] i. [BNA] Auricle; the upper chamber of each half of the heart, receiving the blood from the venae cavse on the right side and from the pulmonary veins on the left, and transmitting it to the ventricle of the same side. z. The tympanum proper, that part of the tympanic cavity which lies immediately to the inner aspect of the dnun membrane. 3. The portion of the nasal cavity lying below and behind the agger and above the vestibule, anterior to the middle meatus. 4 Infundibvilum (6). a. dex'trum, the a. of the right side of the heart which receives the blood from the vense cav^. a. glott'idis, vestibulum laryngis. a. mea'tus me'dii, the anterior expanded portion of the middle meatus of the nose, just above the vestibule, a. pulmona'le, a. sinistrum. a. sin is'trum, a. of the left side of the heart which receives the blood from the pulmonary veins, infec'tion a., the part through which the pathogenic microorganisms gain entrance into the body in any given infectious disease,