part of acrostichal bristle FBbt:00004320 VFB:FBbt_00004320 Microchaeta of the scutum of the adult dorsal mesothorax in the acrostichal region. They are located on either side of the midline and medially to the dorsocentral region. These bristles are arranged roughly in anterior/posterior rows, with a few rows present. fly_anatomy.ontology scutum microchaeta adult thoracic mechanosensory chaeta bristle of mesothoracic tergum