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The suboesophageal ganglion (acronym: SOG; synonym: subesophageal ganglion) of arthropods and in particular insects is part of the arthropod central nervous system (CNS). As indicated by its name, it is located below the oesophagus, inside the head. As part of the ventral nerve cord, it is connected (via pairs of connections) to the brain (or supraoesophageal ganglion) and to the first thoracic ganglion (or protothoracic ganglion). Its nerves innervate the sensory organs and muscles of the mouthparts and the salivary glands.
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