THE EYE. 411 



It is usual for the anterior ciliary arteries to come from the 

 muscular branches. 



The Ophthalmic Artery, after having detached all the afore- 

 said branches, is much diminished in volume, and, advancing 

 along the internal parts of the orbit, its next branch is 



6. The Arteria Ethmoidea Anterior, which dips into the an- 

 terior internal orbitary foramen, and is divided into small 

 branches, some of which are spent upon the adjacent portion of 

 the dura mater, others upon the frontal sinus and the anterior 

 ethmoidal cells. Some of these branches penetrate from the 

 cranium through the cribriform plate into the nose, and, ramify- 

 ing upon the Schneiderian membrane, anastomose with the in- 

 ternal maxillary. 



7. The Arterrse Palpebrales are two In number: they come 

 sometimes from a common trunk, and on other occasions arise 

 separately. One is the Superior, and the other the Inferior. 

 The latter arises first, and is distributed to the conjunctiva, the 

 caruncula lachrymalis, lachrymal sac; and finishes by many 

 small branches to the lower eyelid, that anastomose with the 

 infra-orbitar artory, so as to form the lower tarsal arch. It 

 also anastomoses with the lachrymal artery by its extreme 

 branches. 



The Superior Palpebral Artery also distributes branches to 

 the conjunctiva, sac, and caruncle; it then emerges above the 

 inner palpebral ligament, around the margin of the superior 

 eyelid, and forms, along with the lachrymal and the supra orbi- 

 tar artery, the superior tarsal arch, which distributes small 

 branches, in great profusion, to the orbicularis muscle, and to 

 the structure, generally, of the lid. It anastomoses, externally, 

 with the lower palpebral artery. 



8. The Arteria Nasalis is sometimes a well marked continua- 

 tion of the ophthalmic. It passes out of the orbit at its inter- 

 nal canthus, above the internal palpebral ligament, and anasto- 

 moses at the root of the nose with the facial artery. It is dis- 

 tributed to the side of the nose, and to the lower part of the 

 forehead. Its chief contribution to the eyelids is at the internal 



