develops from rostral trichoid sensillum proximal rostral sensillum FBbt:00004169 fly_anatomy.ontology VFB:FBbt_00004169 Prst proximal rostrum sensillum trichodeum Trichoid sensillum located medial to the tentorium in the rostral membrane of the adult head (Haynie and Bryant, 1986). There are approximately six of these on each side (Haynie and Bryant, 1986). ventral occipital bristle presumptive proximal rostral sensillum