THE BONES OF THE HEAD 



153 



27 26 

 Fig. 86. — The Internal Base of the Skull. 



The Superior Surface of the Petrous Portion of the Right Temporal Bene has been removed to 

 expose the Internal Auditory Meatus and Semicircular Canals.) 



Foramen Caecum 



Crista Galli 



Ethmoidal Spine of Sphenoid 



Jugum Sphenoidale 



Anterior Fossa 



Limbus Sphenoidalis 



Optic Groove 



Olivary Eminence 



Sylvian Border of Small 



Wing of Sphenoid 

 Anterior Clinoid Process 

 Middle Clinoid Process 

 Sella Turcica 

 Posterior Clinoid Process 

 Dorsum Sellse 

 Basilar Groove 

 Groove for Inf. Petrosal 



Sinus 

 Superior Semicircular Canal 

 External Semicircular Canal 



Posterior Semicircular Canal 



Internal Auditory Meatus 

 (laid ojjen) 



Opening of Internal Audi- 

 tory Meatus 



Anterior Condylar Foramen 



Basion 



Groove for Lateral Sinus 



Vermiform Fossa 



Torcular Herophili 



Int. Occipital Protuberance 



Internal Occipital Crest 



Opisthion 



Cerebral Fossa 



Cerebellar Fossa . 



Jugular Foramen 



Sigmoid Groove 



Internal Auditory Meatus 



Gasserian Depression 



Emioentia Arcuata 



37. Hiatus Fallopii 



38. Accessory Hiatus 



39. Foramen Lacerum Medium 



40. Foramen Spinosum 



41. Foramen Ovale 



42. Middle Fossa 



43. Foramen Vesalii 



44. Ljn^la of Sphenoid 



45. Parietal Bone 



46. Coronal Suture 



47. Cavemotis Groove 



48. Pterion 



49. Foramen Rotundum 



50. Orbital Plate of Frontal 



51. Sf^enoidal Fissiue 



52. Carotid Notch 



53. Optic Foramen 



54. Posterior Ethmoidal Canal 



55. Anterior Ethmoidal Canal 



56. Left Frontal Sinus 



