<prompt> Waldeyer;s ring consists of all of the following except?Palatine tonsilsPharyngeal tonsilsTubal tonsilsPost auricular nodes  <response>: In relation to the oropharyngeal isthmus, there are several aggregations of lymphoid tissue that constitute Waldeyers lymphatic ring. The most impoant aggregations are the right and left palatine tonsils usually referred to simply as the tonsils. Posteriorly and above there is the pharyngeal tonsil; laterally and above there are the tubal tonsils, and inferiorly there is the lingual tonsil over the posterior pa of the dorsum of the tongue. Ref: BD Chaurasias HUMAN ANATOMY, Volume 3,4th edition. 