CRANIAL CAVITY. 



Oculo-motor. Both branches run through the sphenoidal 

 fissure between the heads of the External rectus, separated by 

 the nasal nerve; the superior branch supplies the Superior rec- 

 tus and Levator palpebrse superioris; the inferior branch sup- 

 plies the Internal rectus, Inferior rectus, and Inferior oblique 

 and gives off the short root of the ciliary ganglion. [676] 



Trochlear. Running through the sphenoidal fissure above 

 the muscles, this enters the superior surface of the Superior 

 oblique. [677] 



Abducent. Running through the sphenoidal fissure be- 

 tween the heads of the External rectus and below the nasal and 

 oculo-motor, this enters the inner surface of the External 

 rectus. [686] 



Superior Maxillary. The orbital branch runs through the 

 sphenoidal fissure and then along the outer wall of the orbit 

 and through the orbital canal of the malar; it communicates 

 with the lachrymal. [681] 



Optic. Running through the optic foramen above the oph- 

 thalmic artery, this enters the eyeball. [675] 



ARTERIES. 



Ophthalmic. This runs through the optic foramen and 

 forward over the optic nerve to the inner side of the orbit, and 

 divides into the frontal and nasal. Branches: Posterior cili- 

 ary, running beside the optic nerve to the eyeball. Central 

 artery of retina, running in the optic nerve. Recurrent, pass- 

 ing through the sphenoidal fissure to the dura. Lachrymal, 

 to the gland. Muscular. Anterior ciliary, to the eyeball in 

 front. Supra-orbital, running through the supra-orbital notch 

 to the forehead. Anterior and posterior ethmoidal, passing 

 through the ethmoidal canals. Palpebral, to the eyelids. 

 Nasal, to the nose. Frontal, to the forehead. [815] 



VEINS. 



Ophthalmic. This runs through the sphenoidal fissure be- 

 tween the heads of the External rectus and joins the cavern- 



[55] 



