part of trichome larval dorsal hair fly_anatomy.ontology Disambiguation: a dorsal hair differs from a dorsal sensory hair (see figure 3.14 of Campos-Ortega and Hartenstein, 1997) in that it is a trichome, and therefore is not innervated. Hair on the dorsal surface of the larva on all segments except the prothorax, which is devoid of them. Members of this group are distributed in a well defined pattern. In the thoracic segments, three types of hairs are seen, organized in regions from anterior to posterior. In the abdominal segments, there are only two types, corresponding to the types seen in the anterior region of the thoracic segments. The polarity of the hairs is also different between the thoracic and abdominal segments. FBbt:00004980 embryonic/larval cuticle