Fig. 2
From: Neurons of self-defence: neuronal innervation of the exocrine defence glands in stick insects
a The defence gland in P. schultei is innervated by the Nervus anterior from the suboesophageal ganglion (SOG) (filled arrow) which runs under a cuticular apodeme (asterisk) to the ipsilateral gland. The nerve splits into two branches (indicated by two arrowheads) on the lateral and dorsal side of the gland. The empty arrow indicates the location of the defence gland opening in the thorax. Preparation of an adult female individual. b In S. sipylus, the defence gland (indicated by dotted line) is notably smaller than in P. schultei. Innervation also occurs by the N. anterior SOG (white arrow). Preparation of an adult female. Abbreviations: dg, defence gland; N. trans., Nervus transversus; SOG, suboesophageal ganglion; T1, prothoracic ganglion. Scale bars: (a) 1 mm, (b) 500 μm