Fig. 2. Anatomy and innervation of the femoral chordotonal organ (fCO). (A) A Ni2+-filled preparation of the middle leg nerves and fCO. The anterior dorsal cuticle of the trochanter and femur has been removed to provide a view of the internal structures. (B) Drawing of the preparation in A, identifying the main structures, named according to Snodgrass (1929) for the locust. Note the proximal (pr) and distal (d) portions of the fCO, the leg nerves 5B1 and 5B2 and the receptor apodeme. Shading indicates the cut surface of the leg cuticle, exposed by removing the anterior-dorsal half of the trochanter and femur (see above). (C) Drawing of a female hind leg and fCO; the arrow indicates the location, and the bracket the size, of the fCO in the leg. Labelling as in B. The inset shows an expanded view of the fCO. Scale bars, 800 µm for A and B, 10 mm for C.
