490 OPHTHALMIC NERVE. 



The Frontal or Supra Orbitar branch proceeds forward in 

 the upper part of the orbit, exterior to the membrane which 

 lines it, and divides into two ramifications. One of these is 

 small, (supra-trochlear^) and passes out of the orbit near the 

 pulley of the superior oblique, to be spent upon the orbicularis 

 muscle and the contiguous parts. 



The other ramification, the proper supra-orbital, passes 

 through the supra orbitary foramen, or through the notch, 

 which is in the place of that foramen, and divides into a num- 

 ber of twigs, some of which pass transversely towards the 

 side of the head, and communicate with twigs from the portio 

 dura. Most of the others extend upwards on the head. Some 

 are distributed to the anterior part of the occipito-frontalis 

 muscle, and the integuments of the forehead ; others are spent 

 upon the upper portion of the scalp. Some of the extreme parts 

 of these ramifications also communicate with the portio dura. 



The Nasal Branch proceeds obliquely forward towards the 

 inner side of the orbit, and sends a twig in its course, to the 

 lenticular ganglion, called the ganglionic branch. It also 

 sends off some small twigs, to join the ciliary nerves which 

 go from the ganglion. These twigs are called ciliary or 

 iritic, as their distribution is upon the Iris. On the inside of 

 the orbit, a branch leaves it, called the internal nasal, which 

 proceeds through the Foramen Orbitar e Internum Anterius 

 to the cavity of the cranium, and passes a small distance upon 

 the cribriform plate of the ethmoid bone, under the dura mater, 

 to a fissure in the said plate near the crista galli, through 

 which it proceeds into the cavity of the nose. Here it divides 

 into twigs, some of which pass on the septum near its anterior 

 edge, and terminate on the integuments at the end of the nose, 

 while others pass down on the inferior turbinated bone. 



15. The infra-orbital branches distributed upon the cheek. 16. The inferior 

 maxillary nerve. 17. Its anterior or muscular trunk. 18. The posterior trunk ; 

 the two divisions are separated by an arrow. 19. The gustatory nerve. 20. 

 The chorda tympani joining it at an acute angle. 21. The submaxillary gang- 

 lion. 22. The inferior dental nerve. 23. Its mylo-hyoidean branch. 24. 

 The auricular nerve, dividing behind the articulation of the lower jaw, to reu- 

 nite and form a single trunk. 25. Its branch of communication with the facial 

 nerve. 26. Its temporal branch. 



