56 



THE SKULL AND THE BONES OF THE SKULL 



Tabular portion, or supra-occipital 



Squama occipitalis 



External occipital crest 

 Crista occipitalis externa\ 



Crest for the reetus capitis posticus minor muscle 

 Crista m. recti capitis minoris 

 Crest for the reetus capitis posticus 



major muscle 



Crista m. recti capitis majoris 

 Posterior condylar foramen 

 Canalis condyloideus 



External occipital protuberance 

 ,/ Protuberantia occipitalis externa 



Superior curved line 



Linea nuchs superior 



Foramen magnum 

 Foramen occipitale magnum 



Condylar portion, 

 or exoccipital 



Pars lateralis 



Occipital condyle' 

 Condylus occipitalis 



Posterior condylar foramen 

 Canalis hypoglossi 



Inferior curved line 



Linea nuchae inferior 



'Mastoid border 



Margo mastoideus 



Jugular process 

 Processus jugularis 



Jugular notch 

 Incisura jugularis 



x Intrajugular process (variety) 

 1'rocessus intrajugularis (var.) 



Basilar portion or process, or basi-occipital- \Pharyngeal tubercle 1 



Pars basilaris Tuberculum pharyngeum 



1 Pharyngeal spine. U.S. 



FIG. ii2. THE OCCIPITAL BONE SEEN FROM BELOW (EXTERNAL BASAL SURFACE). 

 Tabular portion, or supra-occipital c 



'Lambdoid border 



Margo lambdoideus 



Internal occipital crest 

 Crista occipitalis interns 



Lateral sulcus 

 Sulcus transversus 



~ Inferior occipital fossa 



Foramen magnum 



Sigmoid sulcus 

 Sulcus sigmoideus 



Jugular process 

 Processus jugularis 



Jugular notch 

 Incisura jugularis 



Intrajugular process (variety) 

 Processus intrajugularis (var.) 



Jugular eminence 

 Tuberculum jugulare 



Mastoid border 



Margo mastoideus 



_ Anterior condylar foramen 



Canalis condyloideus 



Posterior condylar foramen 



"Canalis hypoglossi 



Condylar portion, or exoccipital 



Pars lateralis 



Basilar groove 

 Clivus 

 Inferior petrosal sulcus 



Sulcus petrosus inferior 



I Basilar portion or process, or basi-occipital 

 Pars basilaris 



FIG. 113. THE OCCIPITAL BONE SEEN FROM ABOVE (INTERNAL BASAL SURFACE). 



Os occipitale The occipital bone. 



