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| Sympathetic Nervous System |
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| It is also called the autonomic or stomatogastric or visceral nervous system. It is made up of a collection of ganglia and nerves. The ganglia that form a part of this system are the frontal, occipital, visceral and proventricular. |
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| The frontal ganglion is present in front of the brain and is connected to it by a pair of connectives. A median recurrent nerve arises from it and passes backwards and connects to the occipital ganglion. |
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| The occipital ganglion, also called the hypocerebral ganglion, is present behind the brain. Three nerves originate from this ganglion - two lateral and one median. The lateral nerves innervate two endocrine glands and the median nerve connects the next ganglion, the visceral ganglion. |
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| The visceral ganglion is present on the crop. One of the nerves supply to the alimentary canal and the other joins the next ganglion, the proventricular ganglion. |
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| The proventricular ganglion is present on the gizzard. |
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