THE FIFTH, TRIGEMINAL, OR TRIFACIAL NERVE 



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from the plexus surrounding the middle meningeal artery. The ganglion also 

 communicates with the auriculotemporal nerve (ramus anastomoticus cum n. 

 auriculotemporali). This communicating filament is probably a branch from 

 the glossopharyngeal which passes to the ganglion, and through it and the auriculo- 

 temporal nerve to the parotid gland. A slender filament, the sphenoidal, ascends 

 from it to the Vidian nerve. 



Branches of Distribution. Its branches of distribution are a filament to the 

 Tensor tympani (n. tensoris tympani) and one to the Tensor palati (n. tensor is 

 veli palatini). The former passes backward on the outer side of the Eustachian 

 tube; the latter arises from the ganglion, near the origin of the internal pterygoid 

 nerve, a"nd passes forward. The fibres of these nerves are, however, mainly 

 derived from the nerve to the Internal pterygoid muscle. 



The Submaxillary Ganglion (ganglion submaxillare) (Fig. 734) is of small size, 

 fusiform in shape, and situated above the deep portion of the submaxillary gland, 

 near the posterior border of the Mylohyoid muscle, being connected by filaments 

 with the lower border of the lingual nerve. 



FIG. 736. The otic ganglion and its branches 



Branches of Communication. This ganglion is suspended from the lingual nerve 

 by two filaments (rami communicantes cum n. linguali), which join it separately 

 at its fore and back part. It also receives a branch from the chorda tympani, 

 and communicates with the sympathetic by filaments from the sympathetic plexus 

 around the facial artery. 



Branches of Distribution. These are five or six in number; they arise from the 

 lower part of the ganglion, and supply the mucous membrane of the mouth and 

 the submaxillary or Wharton's duct, some being lost in the submaxillary gland 

 (rami submaxillares]. The branch of communication from the lingual nerve 

 to the fore part of the ganglion is by some regarded as a branch of distribution, 

 by which filaments of the chorda tympani pass from the ganglion to the lingual 

 nerve, and by it are conveyed to the sublingual gland and the tongue? 



Surface Marking. It will be seen from_the above description that the three terminal 

 branches of the three divisions of the trigeminal nerve emerge from foramina in the bones of 

 the skull and pass on to the face; the terminal branch of the first division emerging through the 



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