ANATOMY IX A NUTSHELL. 385 



off a branch to the dura mater and a nasal branch which passes through the cribri- 

 form plate of the ethmoid anastomosing with branches of the spheno-palatine. 



The anterior ethmoidal accompanies the nasal nerve through the anterior 

 ethmoidal foramen into the cranium, supplying the anterior ethmoidal cells and 

 frontal sinus. It gives meningeal branches to the dura mater and passes through 

 the nasal slit to be distributed under surface of the nasal bone and the skin of 

 the nose. 



The internal palpebral are two in number, coming from the ophthalmic 

 opposite the pulley of the Superior oblique. These pass between the dorsal 

 cartilages and the Orbicularis palpebrarum. 



The frontal artery is one of the terminal branches. It passes upward at 

 the inner angle of the eye anastomosing with the supraorbital and the artery of 

 the opposite side, to be distributed to the integument, muscles, and pericranium. 



The nasal branch is another terminal branch. It leaves the orbit above 

 the tendo oculi. It gives branches to the lachrymal sac. Its transverse nasal 

 branch anastomoses with the angular and its dorsalis nasi supplies the outer 

 surface of the nose and anastomoses with the artery of the opposite side and 

 lachrymal branch of the facial. 



The ciliary arteries are the short, long, and anterior. The short ciliary 

 are eight or ten in number. They come from the ophthalmic or some of its 

 branches. They pierce the sclerotic coat forming a circle around the optic 

 nerve, passing forward on the inner surface of the choroid, supplying the 

 choroid coat and the ciliary processes. The long ciliary are two in number 

 which pierce the sclerotic coat running forward to form two arches, the circulus 

 major which is around the circumference of the iris and the circulus minor 

 around the papillary margin. The anterior ciliary come from the muscular 

 branches and pass forward with the tendons of the Recti muscles. They form 

 a network beneath the conjunctiva and pierce the sclerotic coat a short dis- 

 tance from the cornea to join the circulus major at the iris. 



The arteria centralis retina pierces the optic nerve obliquely about one- 

 fourth an inch behind the eye-ball. It is one of the smallest branches of the 

 ophthalmic. It enters the globe of the eve-ball through the porus opticus. It 

 supplies the inner surface of the retina and is accompanied by the corresponding 

 veins. In the fetus a branch passes from this artery through Stilling's canal 

 to the capsule of the lens. It lies beneath the sheath before it pierces the nerve. 



LESSON CVIII. 



Muscular branches are given off from various branches of the ophthalmic 

 and are two in number, the superior and inferior. They may come from Un- 

 common trunk. The superior one supplies the Superior rectus. Levator pal- 

 pebrae, and Superior oblique. The inferior one supplies the Inferior rectus, 

 External rectus. Internal rectus, and Inferior oblique. This inferior one gives 

 off one of the anterior ciliary branches. Muscular branches are also given off 

 from the lachrymal, supraorbital, and the ophthalmic itself. 



