Dissection of Sheep's Head. 



249 



The ganglionic mass is of a reddish grey colour, but is not 

 easily distinguished from the surrounding fat ; this ganglion 

 resembles the other ganglia in connection with the Fifth 

 nerve, in having sensory, sympathetic, and motor roots con- 

 nected with it. Its motor root is formed by the Yidian nerve, 

 which does not here run in a separate osseous canal as it does 

 in Man, and so may be traced, as the principal branch, back 

 as far as the under or internal aspect of the Fifth nerve ; 

 beyond this point it is not easily traced, but its course may 

 be here noted, through the back part of the cavernous sinus 

 to the superior cervical ganglion, which will be exposed later 

 on, hidden now by the par-occipital process and the muscles 

 thereto attached. The emergent branches of the Spheno- 

 palatine ganglion are distributed to the muscles and vessels 

 of the orbit, to the soft and hard palate, and to the nose. 



Close adjoining the line of the Spheno -palatine ganglion 

 and its several cords, is the line of the Dental nerve, which 

 quits the main trunk of the Superior Maxillary soon after it 

 leaves the Gasserian ganglion, passes along the floor of the 

 orbit, enters a canal in the maxilla, and then supplies the teeth. 

 We have now traced the principal branches of the Fifth nerve, 



as follows '. [ i Supra-orbital, to fore- 

 Ophthalmic diyi- j \ head. 

 / sion (with Ciliary { \ Lachrymal, to 1. gland 

 ganglion). | ' ~~^ ^'^ 



Fifth 

 or 



Trigeminal 



or 



Trifacial 



Nerve. 



Sensory root, 

 through Gasserian 

 Ganglion to all 

 three divisions. 

 Motor root. 

 InferiorMaxillary 

 division alone. 



Superior Maxillary 



division 

 (with Spheno-Pala- 

 tine Ganglion). 



Inferior MaxiUary 



division 

 (with Otic & Sub- 

 maxillary ganglia) . 



and eyelid. 

 Nasal, to nose & eyelid 

 Orbital, to eyelid and 



side of face. 

 Infra-orbital, to lower 

 eyelid, side of nose, 

 and upper lip. 

 Dental, to teeth of up- 

 per jaw. 

 / Buccal, to cheek and 

 J angle of mouth. 

 j Auriculo - temporal : 

 ' through parotid gland 

 Gustatory or Lingual, 

 to tongue. 

 / Inferior Dental, to 

 j teeth of lower jaw, 

 j lip, and chin. 

 \ Mylohyoid, to Mylo- 

 hyoid muscle. 



K K 



