INSECTS
Fig. 123. Vertical lengthwise section through the middle of the body of a male cicada, showing the great air chamber almost filling the abdomen
An, anus; Bk, beak; 1Gng, 2Gng, first and second nerve centers of the thorax; Int, intestine; IT, back plate of first abdominal segment; ISp, first abdominal spiracle, opening into air chamber; IXT, ninth abdominal segment; j, plate supporting the tympanal muscles (TmMcl); LMcl2, thoracic muscles; OE, oesophagus; Rect, rectum; Rpr, organs of reproduction; Stom, stomach; T1, T2, T3, back plates of thorax; TmMcl, muscle of right tympanum; VIIIT, eighth abdominal segment
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