104 ANATOMY AND PHYSIOLOGY FOR NURSES 



cavernous and inferior petrosal sinuses, pituitary body, 

 and Gasserian ganglion. 



The anterior meningeal supplies the dura mater of the 

 anterior fossa. 



The ophthalmic artery arises from the cavernous por- 

 tion, enters the orbit by the optic foramen, dividing at the 

 inner angle of the eye into two terminal divisions the 

 frontal and the nasal which further divide into the 

 following branches: 



Lacrimal. 



Orbital: 



Supra-orbital. 



Posterior ethmoid. 



Anterior ethmoid. Ocular . 



Palpebral. 



Frontal. 



Nasal. 



Muscular. 



Anterior ciliary. 



Short ciliary. 



Long ciliary. 



Arteria centralis retinae. 



The anterior cerebral artery enters the longitudinal 

 fissure between the two hemispheres of the brain; it gives 

 branches to the olfactory and optic nerves. The two arte- 

 ries on each side join, shortly after origin, by a short anas- 

 tomosing branch. (See chapter on the Nervous System 

 for a more complete description of the arteries that supply 

 the brain, including the middle cerebral, posterior com- 

 municating, and anterior choroid.) 



The Subclavian Artery. The right subclavian 

 artery takes it origin from the innominate artery, opposite 

 the sternoclavicular articulation; the left arises directly 

 from the aorta. At the lower border of the first rib it 

 ceases to be called the subclavian, and becomes the axil- 

 lary. For descriptive purposes the artery is generally 

 divided into three sections. This division is necessary, 

 owing to the fact that there is a difference in the origin of 

 the right and the left arterial trunk; it follows, therefore, 

 that there is a marked difference in the first part of the 

 course of this artery. On the right, the first portion passes 



