72 THE POCKET ANATOMY 



deep temporal and transverse facial. Branch sent back to 

 anas, middle meningeal through sphenoid fissure 



Central of retina : pierces optic nerve, runs in its substance 

 to retina (vide Eye) . 



Branches arising over Optic Nerve : 



Posterior ciliary : divided into two sets. Short (10) perforate 

 sclerotic and supply choroid. Long (2) pass forward between 

 choroid and sclerotic; anas, anterior ciliary and supply iris 

 and ciliary processes. 



Supra-orbital : ascends with frontal nerve over muscles, etc., 

 to supra-orbital foramen ; passing out, ascends over frontal 

 bone ; anas, temporal, facial and frontal. 



Branches arising internal to Optic Nerve : 



Muscular, superior and inferior : to muscles of orbit, give off 

 anterior ciliary (6-8), which pierce sclerotic behind cornea. 



Ethmoidal : anterior and posterior to ethmoidal cells, through 

 anterior and posterior internal orbital canals respectively, 

 supplying also dura mater, the anterior accompanying nasal 

 nerve to skin of nose (anterior nasal branch). 



Palpebral (2) : one for each lid, arise near pulley, form an 

 arch in each lid, and supply lachrymal apparatus. 



Terminal Branches : 



Frontal : turns upwards round inner margin of orbit ; anas. 

 supra-orbital. 



Nasal : over tendo oculi to root of nose ; anas, nasal and 

 angular of facial. 



Branches from Cerebral Portion of Internal Carotid : 



Anterior cerebral : arises at inner extremity of fissure of 

 Sylvius, passes forwards in great longitudinal fissure. Oppo- 

 site arteries united by anterior communicating. It then curves 

 round fore part of corpus callosum, supplying offsets to corpus 

 callosum, frontal and parieto-occipital sulci, and to anterior 

 perforated spot. 



Middle cerebral: largest offset, enters fissure of Sylvius, 

 dividing into branches for external surface of hemisphere, 

 and interior of brain, the latter entering anterior perforated 

 spot. Internal branches: Caudate, thalamic, and lenticulo- 

 striate. External branches: Frontal, parietal, parieto-tem- 

 poral, and temporal. 



Posterior communicating: from posterior part of artery, 

 runs backwards ; anas, posterior cerebral of basilar. 



Anterior choroid : from back part of artery, passes 

 backwards and outwards to enter descending horn of 

 lateral ventricle, just beneath edge of middle lobe ; supplies 



