Cranial Nerves. 



131 



Canal, 

 naso-palal 



.N. PETROS. 

 "SUPERF. MAJ. 



N. PETROS. PROF. 



N. PHARYNX 



N. PALAT. DESCEND. 



475. The Spheno-Palatine Ganglion. 



The largest ganglion of the trigeminal nerve is the Gasserian 

 or s e m i 1 u n a r g a n g 1 i o n, Ganglion Gasseri (see Fig. 471), somewhat 

 crescentic in shape and formed only by the posterior sensory root of the 

 fifth nerve. 



The ophthalmic, lenticular or ciliary ganglion, Gang- 

 lion ciliare (see Fig. 469 and 470), about the size of a pin's head, is 

 situated in the orbit between the external rectus muscle and the optic 

 nerve. Its roots are: the short root, Radix brevis (motor) derived from 

 the oculomotor nerve; the long root, Radix longa (sensory) derived from 

 the nasal nerve, and the sympathetic root, Radix sympatliica, from 

 the carotid plexus. From the ciliary ganglion 10 16 ciliary nerves 

 arise; they are disposed in two bundles, which pierce the sclerotic, 

 pass between the latter and the choroid to the ciliary muscle, and supply 

 this muscle, the iris and cornea. 



The s p h en o - p a 1 a tin e or Meek el's ganglion, Ganglion 

 splicno-palatinum s. pterygo-palatinum (Meckdii), is deeply placed in the 

 spheno-maxillary fossa close to the spheno-palatine foramen, and is 

 connected by a few short filaments (Nervi splieno-palatini) with the II. division 

 of the trigeminus. Its branches are : 



a) The ascending or orbital branches, Ramuli orbitaks, 

 which enter the orbit by the spheno-maxillary fissure, and supply the 

 periosteum. 



He it zip a nn, Atlas. II. 18 



