246 



HEAD AND NECK 



PLATE X 



p IG> Q 2 . _ Dissection of the Orbit and the Middle Fossa of the 

 Cranium. On the right side the trochlear nerve has been 

 removed, and in the left orbit portions of the structures 

 above the ophthalmic artery have been taken away. (Dr. 

 E. B. Jamieson.) 



Superior sagittal sinus. 



Cut anterior part of falx cerebri. 



Muco - periosteum of anterior 



ethmoidal air cell. 

 Anterior ethmoidal artery and 

 nerve and posterior ethmoidal 

 artery. 

 Muco - periosteum of a middle 



ethmoidal air cell. 

 Muco-periosteum of a posterior 



ethmoidal air cell. 

 Optic nerve. 

 Ophthalmic artery. 

 Internal carotid artery. 

 Wall of right cavernous sinus. 

 Oculo-motor nerve. 

 . Basilar plexus. 



Abducens nerve. 

 . Inferior petrosal sinus. 

 . Semilunar ganglion. 

 . Middle meningeal artery. 



17. Mandibular nerve. 



1 8. Maxillary nerve. 



19. Oculo-motor nerve. 



20. Trochlear nerve. 



21. Frontal nerve. 



22. Superior ophthalmic vein. 



23. Orbital branch of middle menin- 



geal artery. 



24. Posterior ciliary arteries and 



short ciliary nerves. 



25. Lacrimal artery and nerve. 



26. Superior rectus. 



27. Levator palpebrae superioris. 



28. Supra-orbital nerve. 



29. Supra-trochlear nerve. 



30. Supra-orbital artery. 



31. Terminal part of ophthalmic 



artery. 



32. Muco-periostemn of infundibu- 



lum. 



