THE NERVES. 393 



tympanum, and passes out through theforam. stylomastoideum to 

 the face. At the bend the small root forms a ganglionic enlarge- 

 ment, this is : 



ganglion geniculatum, a grayish-red, triangular ganglion which 

 receives the n. Vidian. superficial, (of nerv. trigemin.) and 

 gives off; a. some minute filaments which again sink back- 

 wards into the auditory nerve with a reddish enlargement ; b. a 

 filament, which passes to the long root of gangl. oticum. Be- 

 fore it leaves the canal the n.facialis gives off: 



1. Ram. ad fenestram ovakm going along through a small 

 canal in the posterior part of the fenestra ovalis. 



2. Nervus stapedii, passes obliquely inwards to the muscular 

 portion of m. staped. 



3. Chorda tympani, that is, a nerve which runs along a canal 

 peculiar to it (canal chordce), in the posterior wall of the 

 tympanum, backwards and upwards, then forwards in the 

 arch through the cavity of the tympanum, free, between the 

 long crus of the incus and the manubrium of the malleus, 

 and passing forth from a small foramen in the centre of 



fissura Glasseri, it applies itself to n. lingualis, and gives a 

 long motor root to the ganglion linguale. 



4. Rami communicantes cum n. vago, come from the auricu- 

 lar branch of n. vagus, two small branches. 



Having made its exit at the foram. stylo-mast, the n. facialis, 

 whilst situated behind the parotis, gives off the following branches : 



5. N. auriculo-occipitalis s. occipitalis posterior, inclines, from 

 the sty lo-mastoid foramen upwards, and divides into a larger 

 ram. occipitalis, which ramifies in the m. occipit., the perios- 

 teum, and on the vessels, and anastomoses with a filament of 

 plez. cervicalis ; and into a ram. auricularis, which supplies 

 the mm. retrahentes of the auricle [and the other muscles] 

 and anastomoses with the rr. temporales of n. trigemini and 

 facialis and the auricular branch of n. vagus. 



6. N. stylo-hyoideus inclines obliquely outwards to the m. stylo- 

 hyoid., and anastomoses with the n. sympathicus and first 

 cervical nerve. 



7. N. digastricus to the posterior belly of m. digastricus, gives 

 branches to the carotis, and unites with n. vagus, trigeminus 

 and sympathicus. 



8. Rami parotidei posteriores come partly from the trunk, 

 partly from the branches, and terminate in the substance of 

 the parotis. 



After this the trunk curves forwards in the anterior half of the 



