Fig. 3. Antennal anatomy. (A) Longitudinal section through the two distal antennal segments, the pedicel and the funiculus. The pedicel/funiculus joint, the funicular hook and the funicular stalk are depicted. (B) Cross section through the pedicel at the level of the pedicel/funiculus joint. (C) Detail from B showing the medial (Med) and posterior (Post) groups of receptors, their distal threads (T), the `V'-shaped sites to which the threads attach (V) and the membrane (M) that suspends the flagellar hook in the pedicel. (D) Cross section through the funiculus at the level of the insertion of the arista. Connections between the funiculus and the arista (I) and between the three sub-elements that make up the arista (II, III) are depicted. Scale bars, 50 µm (A,B,D) and 25 µm (C).