part of part of medulla oblongata area postrema SCTID:369039005 EMAPA:35143 GAID:591 A small, rounded eminence on each side of the fourth ventricle, which receives nerve fibers from the solitary nucleus , spinal cord, and adjacent areas of the medulla. The area postrema lies outside the blood-brain barrier and its functions include acting as an emetic chemoreceptor. BTO:0003425 FMA:72607 BIRNLEX:2636 MESH:D031608 Wikipedia:Area_postrema UBERON:0002162 TAO:0005146 chemoreceptor trigger zone MA:0001034 ZFA:0005146 HBA:9522 BAMS:AP MBA:207 DHBA:12807 fourth ventricle sensory circumventricular organ