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Figure 2


Fig. 2. Schematic diagram of the optic ganglia of Cancer species highlighting the location and organization of the X-organ-sinus gland (XO-SG) system. The nervous system contained within the eyestalk consists of several distinct regions, including the medulla terminalis (MT), the medulla interna (MI), the medulla externa (ME), the lamina ganglionaris (LG) and the retina. This system of ganglia is connected to the supraesophageal ganglion (SoG) via the optic nerve (optn). Located in the MT is a loosely associated collection of neurosecretory somata that are collectively termed the X-organ (XO). The release site of hormones produced by these somata is the sinus gland (SG), which is located at the junction of the MI and ME. The sinus gland tract (sgt) links the XO and SG.





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