DISSECTING MANUAL. 



dental both descend in bony canals, in the wall of the antrum, 

 to the alveolar arch and supply the incisors, canine, and pre- 

 molars ; they communicate with the posterior dental. Branches 

 on the Face. The nerve divides into three sets of radiating 

 branches, viz.: palpebral, to the lower eyelid; nasal, to the 

 side of the nose; and labial, to the cheek and upper lip. All 

 these communicate with the facial, thus forming the infra- 

 orbital plexus. [682] 



Meckel's (Spheno-palatine) Ganglion. This lies in the 

 upper part of the spheno-maxillary fossa below the superior 

 maxillary nerve and is small and reddish-gray. Roots: The 

 sensory are the spheno- palatine branches of the superior max- 

 illary. The motor and sympathetic are the Vidian nerve, which 

 is formed by the (motor) great superficial petrosal, from the 

 facial geniculate ganglion, and the (sympathetic) great deep 

 petrosal from the carotid plexus. [682] 



Branches. The ptery go-palatine runs backward in the ptery- 

 go-palatine canal to the mucosa on the roof of the pharynx. 

 The large posterior palatine descends in the large posterior 

 palatine canal to the mucosa of the soft and hard palate; a 

 branch (inferior nasal) arising in the canal goes to the mucosa 

 on the lower part of the outer nasal wall. The small posterior 

 palatine descends in the small posterior palatine canal and 

 through the tuberosity of the palate bone to the mucosa of the 

 soft palate, uvula, and tonsil. The accessory posterior palatine 

 twigs descend in accessory posterior palatine canals to the 

 mucosa of the tonsil, soft palate, and uvula. The superior 

 nasal runs through the spheno-palatine foramen to the upper 

 and posterior part of the outer nasal wall. The orbital twigs 

 ascend to the orbital periosteum. The naso-palatine runs 

 through the spheno-palatine foramen and across the roof of 

 the nose, then passes downward and forward on the septum, 

 grooving the vomer, and through the foramen of Scarpa (the 

 left nerve in front) and then runs backward; it supplies the 

 mucosa of the roof and septum of the nose, and that of the 



[70] 



