THE SKULL AND THE BONES OF THE SKULL 



77 



Frontal eminence 



Tuber frontale 



Lachrymal fossa 



Fossa glandulac lacrimalis~~ 



External angular process 

 Processus zygomaticus 



Ethmoidal notch 



Incisura ethmoidalis 



Frontal squama 

 Squama frontalis 



- Orbital arch, or supra-orbital ridge 



Margo supra-orbitalis 



Orbital plate 



Pars orbitalis 



Nasal portion 

 Pars nasalis 



FIG. 155. THE Two HALVES OF THE FRONTAL BONE FROM A HUMAN FCETUS IN THE EIGHTH 

 MONTH (MONTHS OF FOUR WEEKS EACH). SEEN FROM BEFORE. 



Body-length of foetus 15 inches. 



Frontal eminence 

 Tuber frontale 



Frontal or metopic suture (var.) 

 Sutura frontalis (var.) 



Temporal crest - 

 Linea temporalis 



Temporal surface' 

 Facies temporalis 



Orbital arch, or supra-orbital ridge 



Margo supra-orbitalis 



Internal table 



Lamina interna 



Diploe 



Diploe 



Frontal sinus 



Sinus frontalis' 



\ Nasal border 



Margo nasalis 

 i Nasal spine 

 Spina frontalis 



FIG. 156. THE FRONTAL BONE OF A GIRL AGED SEVEN YEARS IN WHICH THE FRONTAL 

 SINUSES HAVE BEEN EXPOSED. SEEN OBLIQUELY FROM BEFORE AND FROM THE 

 RIGHT SIDE. 



Development of the Frontal Bones. 



