Answer :
Submandibular ganglion
The human autonomic nervous system includes the submandibular ganglion, often known as the submaxillary ganglion in earlier sources. It belongs to the head and neck's four parasympathetic ganglia. (The otic ganglion, pterygopalatine ganglion, and ciliary ganglion are the others.)
Where is it found?
Little and fusiform in shape, the submandibular ganglion is modest. It is located on the hyoglossus muscle, close to the posterior border of the mylohyoid muscle, over the deep part of the submandibular gland.
The ganglion "hangs" from the lower border of the lingual nerve by two nerve filaments (itself a branch of the mandibular nerve, CN V3). Two anterior and two posterior filaments support it from the lingual nerve. It receives a branch from the chorda tympani nerve, which runs in the sheath of the lingual nerve, through the posterior of these.
Fibers
The submandibular ganglion, like other parasympathetic ganglia of the head and neck, serves as the synapse for parasympathetic nerve fibres as well as carrying other types of nerve fibre that do not synapse in the ganglion. The following is a list of the fibres carried in the ganglion:
sympathetic fibres from the face nerve and its branches, which travel through the external carotid plexus. In this ganglion, they do not synaptize.
Preganglionic parasympathetic fibres from the superior salivary nucleus of the Pons travel to this ganglion through the chorda tympani and lingual nerve.
salivary glands of the submandibular, sublingual, and oral mucosa are all served by postganglionic parasympathetic fibres. They act as these glands' secretomotors. After re-entering the lingual nerve, some postganglionic fibres travel to the sublingual gland.
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