Nervous system of penaeus or prawn

         The nervous system of penaeus consists of supraoesophageal ganglion or brain, circum or perioesophageal connectives, suboesophageal ganglion, nerve cord, thoracic ganglia, abdominal ganglia and nerves.
                 Supra-oesophageal ganglion ornbrain lies on the dorsal side of the thoracic ganglia oesophagus. Suboesophageal ganglion lies on the ventral side of theoesophagus. The brain and the suboesophageal ganglion are connected by two circum- or perioesophageal connectives. The circum-or perioesophageal connectives are connected by a visceral loop (transverse commissure). Nerve cord is double and ventral to the alimentary canal. It arises from the sub oesophageal ganglion and runs upto the end of the abdomen. Between the eleventh and twelfth segments, the two nerves of the ventral cord diverge for the passage of sternal artery. In the thoracic region and the abdominal region two nerve cords form six ganglia each. The brain innervates the eyes, antennules and antennae.

The suboesophageal ganglion innervates the mandibles, two pairs of maxillae and first two pairs of maxillipeds. Thoracic and abdominal ganglia innervate the appendages of their respective segments