part of develops from mesothoracic segment femur mesothoracic leg mesothoracic femur https://www.ento.csiro.au/biology/drosophila/melanogaster.html?mesofemur FBbt:00004689 fly_anatomy.ontology T2 femur Segment of the mesothoracic leg. Proximally, it articulates with the trochanter and distally with the tibia. In the posterior compartment many of the bristles are missing, including the very large bristles (zone of no bristles, ZNB). presumptive mesothoracic femur