162 



CRANIAL NERVES. 



Passing through the cavernous sinus, it escapes from the cranium 

 through the sphenoidal foramen or fissure, and is distributed to the 

 external rectus muscle. Its paralysis will produce an internal squint, 

 A branch enters the carotid canal to join the ganglion of Laumonier. 

 5th. Trifacial. — From the ganglion of Casser, which is upon the 

 trunk^ of this nerve, proceed three branches, the ophthalmic,^ supe- 

 rior maxillary,'' and inferior maxillary. » 



The oj^kthalmic^ passes out through the sphenoidal foramen, and 

 then divides into three branches, the nasal, frontal, and lachrymal. 



The nasal'^^ gives off the iyiternal 

 f'^g- 141. nasal, which enters the anterior 



ethmoidal foramen, and then goes 

 through the cribriform plate into 

 the nose; and also a branch 

 {ratmis ciliaris) to the lenticular 

 or ophthalmic ganglion. It is dis- 

 tributed to the muscles, eyelids, 

 and conjunctiva. The frontal^ 

 divides into two branches, and is 

 spent upon the integuments and 

 muscles of the forehead ; one 

 branch goes through the supra- 

 orbitary foramen. The lachry- 

 'nial'^^ branch supplies the lachry- 

 mal gland, and the contiguous 

 portions of the orbit. 

 ^The superior maxillary'^ passes 

 through the foramen rotundum, 

 and then enters the pterygo-max- 

 illary fossa. A large branch 

 called hifra orbitat^^ traverses the 

 infra-orbital canal, and emerges at the infra-orbital foramen^s to 

 supply the face ; giving off the dental nerves'^^ ^^ in its course. The 

 ptery go-palatine branchy or branches, join the ganglion of Meckel, 

 from which proceed the spheno-palatine branches, which enter the 

 nose through the spheno-palatine foramen ; one of these branches is 

 long, and called naso-palatine, which joins its fellow at the ganglion of 

 Cloquet in \\\q foramen incisivum ; the posterior palatine descends 

 from the ganglion through the posterior palatine foramen, and is distri- 

 buted to the palate and fauces ; the vidian^ox pterygoid, or reciirrent,^^ 

 passes backwards from the ganglion through the pterygoid foramen, 

 and divides into two branches called superficial and deep petrous. The 

 superficial petrous enters the hiatus Fallopii, and passing between the 

 smallerbonesoftheear,emergesattheGlaserian fissure under thename 

 of chorda ty^njiani, which joins the submaxillary ganglion. The deep 

 petrous enters the carotid canal, and joins the ganglion o^ Laumonier, 

 which was formerly considered the origin of the sympathetic nerve. 



