6 4 



THE NERVOUS SYSTEM 



removed. The ophthalmic, maxillary and mandibular (inferior 

 maxillary) nerves arise from the anterior border of the semi- 



FIG. 36. The Branches of the Ophthalmic Nerve. 



Roof of orbit. 

 Crista galli. 

 Dorsum sellae. 

 Petrous temporal. 

 Cut edge of skull. 

 Orbicularis oculi muscle. 

 Superior oblique muscle. 

 Levator palpebne superioris. 

 Superior rectus muscle. 

 Lacrimal gland. 

 Eye-ball. 

 Optic nerve. 

 Oculo-motor nerve. 

 Trochlear nerve. 



4. Trigeminal nerve. 



5. Ophthalmic nerve. 



6. Lacrimal nerve. 



7. Trochlear nerve. 



8. Infra-trochlear nerve. 



9. Anterior ethmoidal nerve. 

 10. Frontal nerve. 



n. Supra-orbital nerve (lateral branch). 



12. Supra-orbital nerve (medial branch). 



13. Supra-trochlear nerve. 



14. Semilunar (Gasserian) ganglion. 



15. Oculo-motor nerve. 



1 6. Trochlear nerve. 



17. Branch to tentorium cerebelli. 

 3. Abducent nerve. 



lunar ganglion, and the last-named is joined by the whole of 

 the small motor root. 



i. The OPHTHALMIC NERVE, which is purely sensory, arises 

 from the semilunar ganglion, and at once enters the lateral wall 



