394 



ANATOMY IN A NUTSHELL. 



I. The ophthalmic branch purely sensory, is the smallest and courses along 

 the outer wall of the cavernous sinus below the third and fourth nerves. It 

 divides into three branches which leave the cranium through the anterior lacer- 

 ated or sphenoidal fissure. (For relation of these branches see Plate CCXXIV.) 

 These branches are the frontal, nasal, and lachrymal. The ophthalmic sup- 

 plies the eye-ball, the lachrymal gland, the orbital and nasal mucous membrane 

 and skin of the eyebrow, forehead, and nose. 



The frontal branch is the largest and is just external to the fourth nerve 

 and the anterior lacerated or sphenoidal fissure and passes forward on the Leva- 

 tor palpebral dividing into two branches. 



PLATE CCTX. 



SUPERIOR FORNIX 



UPPER LID 



LOWER LID 



INFERIOR FORNIX 



Superior Fornix and Inferior Fornix of Conjunctiva. 



LESSON CXI. 



(a) The supraorbital which passes through the supraorbital foramen or 

 notch. It gives a branch to the diplce and mucous membrane of the frontal 

 sinus. The outer and inner branches supply twigs to the pericranium and 

 pierce the Frontalis muscle. They communicate with branches from the facial 

 nerve and are distributed to the skin of the scalp in the frontal and parietal 

 regions. The outer branch is the larger and passes backward almost to the 

 lambdoid suture. 



(b) The supratrochlear nerve is the smaller and passes inward above 

 tin' pulley of the Superior oblique and sends a branch to join the infratrochlear 

 branch of the nasal. It Leaves the orbit between the supraorbital foramen and 

 the pulley and passes upward under cover of the Corrugator supercilii and 

 ( >ccipito-frontalis to supply the skin of the lower part of the forehead near the 

 midline. 



The lachrymal is the smallest branch. It passes to the under surface of 

 the lachrymal gland where ii joins the orbital of the superior maxillary, form- 

 ing a loop which sends branches into the gland. It passes through the sphenoid- 



