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Figure 1


Fig. 1. Schematic representation of the nervous system of a brachyuran crab illustrating the relative locations of the known neuroendocrine organs of Cancer species. The central nervous system (CNS) of brachyurans is generally considered to consist of the supraesophageal (SoG) and fused thoracic ganglia, which are connected via the circumesophageal connectives (cocs). The optic nerves (optns) link the SoG with the ganglia of the eyestalks, the location of the neuroendocrine sinus gland (SG). Another well-known neuroendocrine site is the pericardial organ (PO), which is located in the pericardial chamber surrounding the heart. The POs consist of elaborations of the segmental nerves (sns), which project from the fused thoracic ganglia. Two additional neuroendocrine sites, the anterior cardiac plexus (ACP) and the anterior commissural organ (ACO), are contained within the stomatogastric nervous system (STNS), an offshoot from the CNS that overlies the foregut. The ACPs are located on the anterior cardiac nerves (acns) and the ACOs are located within the commissural ganglia (CoGs). For the sake of future discussion, the stomatogastric ganglion (STG) is also shown in this schematic. It should be noted that this illustration is not drawn to scale and that other portions of the nervous system have been excluded for the sake of simplicity.





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