Fig. 3.

Partial mid-organ sections of two male (A,B) and two female syringes (C,D). The dotted square in the schematic on top indicates the location of the images in A–D. The cranio-caudal length of the medial tympaniform membrane (MTM) was measured between the transition between labium and MTM and the point where the interbronchial desmus (IBD), a band of connective tissue and muscle, connects to the bronchus (indicated by arrows). Bar in C: 100 lm, applies to all images. LL, lateral labia; Ty, tympanum; P, pessulus; A1, A2, A3, first, second and third bronchial half ring.