With what nerve does nervus intermedius fuse with to form the geniculate ganglion?
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The nervus intermedius is a branch of the facial nerve, which arises from the motor and sensory root of the facial nerve in the internal acoustic meatus of the temporal bone. The nervus intermedius contains the taste fibers for the anterior two-thirds of the tongue, and the preganglionic parasympathetic fibers that innervate the submandibular and sublingual glands.
The nervus intermedius fuses with the sensory root of the facial nerve to form the geniculate ganglion, which is a small ganglion situated on the facial nerve in the temporal bone. The geniculate ganglion is responsible for relaying sensory information from the anterior two-thirds of the tongue, via the chorda tympani branch of the facial nerve, as well as innervating the lacrimal gland and the glands of the nasal mucosa via the greater petrosal nerve branch. Additionally, it also contains preganglionic parasympathetic fibers that innervate the submandibular and sublingual glands via the chorda tympani branch of the facial nerve.
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