76 



THE SKULL AND THE BONES OF THE SKULL 



Nasal spine 

 Spina frontalis 



Trochlear spine (var. ) 

 Spina trochlearis (var.) 

 Supra-orbital notch 



Incisura frontalis 



Supra-orbital foramen 

 Foramen supra-orbitale 



Lachrymal fossa 



Fossa glandular lacrimalis 



External angular process 



Processus zygomaticus 



Sphenoidal border 



Marge sphenoidalis' 



Parietal border 

 Margo parietaliS'' 



Anterior internal orbital canal' j 



Foramen ethmoidale anterius / 



Posterior internal orbital canal' 2 

 Foramen ethmoidale posterius 



1 U.S. : Anterior ethmoidal canal. 



Nasal border 

 Margo nasalis 



External orifice of the frontal sinus 

 Apertura sinus frontalis 



/Trochlear fossa -Fovea trochlearis 

 Supra-orbital foramen 

 'Foramen frontale 



Orbital arch, or 

 supra-orbital margin 



Margo supra-orbitalis 



Frontal squama 



Squama frontalis 



Orbital surface 



Facies orbitalis 

 Ethmoidal cells 



Foveolje ethmoidales 



Ethmoidal notch 

 Incisura ethmoidalis 



2 U.S.: Posterior ethmoidal canal. 



FIG. 153. THE FRONTAL BONE SEEN FROM BELOW. 



Supra-orbital foramen 

 Foramen supra-orbitale 



Frontal sinus 



Sinus frontalis* 



Internal table 



Lamina (compacta) interna 



Frontal squama 



Squama frontalis 



Orbital arch, or 

 supra-orbital margin' ;, 

 Margo supra-orbitalis 3 



r 



External angular proieai 

 Processus zygomaticus 



External table 

 , Lamina (compacta) externa 



Uiploe 

 Diploe 



,_ Nasal border 

 VMargo nasalis 



Orbital plate 



Pars orbitalis 

 Septum between the frontal sinuses 



Septum sinuum frontalium 



Anterior internal orbital canal 

 Foramen ethmoidale anterius 



^Nasal spine 

 Spina frontalis 



. ^z^r- "\Frontal sinus Sinus frontalis 

 , Ethmoidal cell Foveola ethmoidalis 



V External orifices of the frontal sinuses 

 Apertura sinuum frontalium 



1 U.S.: Anterior ethmoidal canal. 



FIG. 154. THE FRONTAL SINUSES, SINUS FRONTALES, SHOWN BY THE REMOVAL OF THE EXTERNAL 

 TABLE AND THE DIPLOE, AND PARTLY OPENED UP. SEEN FROM BEFORE AND BELOW. 



Os frontale Frontal bone. 



