part of adult thorax adult pericardial cell adult thoracic pericardial cell FBbt:00013184 fly_anatomy.ontology Pericardial cell of the adult thorax. These cells are binucleate. There are about 10 on each side, anterior and lateral to the cardia, associated with the lower wall of the trachea leading to the fist spiracle and with the adult salivary gland suspensor muscle (FBbt:00003542).