MAX I L LA J! y nnisioy or tiik fifth sfuve :w^ 



but usually R';a-lie.s the j^anj^dioii for the uiost jtart through tlic third and imsal 

 nerves, being ineorj)orated with the motor and sensory root;-. 



From the anterior Ijorder of the ganglion about six short ciliary nerves arise; 

 these subdivide and communicate with the long ciliary nerves, forming al)out twenty 

 nerves which separate into a supero-external and an infero-internal group, and 

 surround the otitic nerve. The nerves jiierce the sclerotic in a circle around the 

 entrance of the optic nerve into the eyeball, and pass forwards between the sclerotic 

 and choroid coats of the eye. They suj)ply nerves of ordinary sensation and trophic 

 nerves to the eyeball (derived from the nasal); the radiating fibres of the iris 

 (derived from the sympathetic); and the ciliary muscle and s})hincter of the ])U]iil 

 (derived from the oculo-motor j (page 850). 



Second ok Maxillai;v Division of the Fifth Nerve 



The maxillary (superior maxillary) division of the fifth nerve is intermediate 

 in size between the mandibular (inferior maxillary) and ophthalmic divisions, and, 

 like the latter, it is entirely sensory in function. It i>roceeds forwards from the 



Fk;. 446. — The Maxillary Nerve seen from wrrHorT. (Beaxmis.) 



ANTERIOR DEXTAL MAAILLARi' NERVE ORBITAL BRANt'll 



NOLIOX 



LOOP FORMED BY MIDDLE AND ANTERIOR DENTAL NERVES 



Gasserian ganglion for about one-third of cin inch Avithin tlie skull, and then passes 

 through the foramen rotundum. It traverses the up]K'r ])art of the spheno- 

 maxillary fossa, and. inclining upwards, passes into the orbit through the spheno- 

 maxillary fissure. It then courses forwards along the infraorbital groove, accom- 

 panied by the infraorbital artery, to the infraorbital canal, and passes through the 

 canal to emerge at the infraorbital foramen, where it terminates, almost innnediately, 

 in three sets of branches, which ]>roceed to the upper lip, the nose, and the lower 

 eyelid. 



Branches. — The l^raiuhes of the maxillary division may be classified intofom- 

 sets, namely: — (1) Intracranial branches: {'!) brandies which are given off in the 

 spheno-maxillarv fossa; (;'>) branches which arise from the ])ortion of the nerve 

 which is [)laced in the infraorlntal canal: and (4 > tcnninal ])ranches. 



The first set (1) consists of one or two recurrent twigs to tlie <lura mater, 

 which form loops with the recurrent branch of the mandilmlar (inferior maxillary 

 division. The second set (2) comi>rises the orbital nerve, the spheno-palatine 

 nerves, and the posterior superior dental nerves. ( 3) The middle aixl anterior 

 48 



