<r + «= 
10. 
MESIAL SAGITTAL SECTION OF THE SKULL. 
167 
From the olivary eminence the floor of the anterior fossa follows a more or less 
horizontal direction, corresponding pretty closely to the level of the axis of the orbital 
cavity. The roof of the orbit is seen to bulge upwards to a considerable extent into the 
floor of the anterior fossa ; whilst the floor of the middle fossa sinks to a level corresponding 
35 34 33 32 31 30 29 
42 41 40 39 38 37 36 
28. 27 
5 6 
Ny | yy 
Fic. 118.—InNER ASPECT OF LEFT HALF OF SKULL SAGITTALLY DIVIDED. 
Suture between parietal and temporal bones. 
Remains of the subarcuate fossa. 
Grooves for branches of the middle meningeal 
artery. 
Dorsum sell. 
Pituitary fossa. 
. Anterior clinoid fossa. 
. Optic foramen. 
Sphenoidal sinus. 
Nasal surface of superior turbinated bone. 
Cribriform plate of ethmoid, 
Nasal surface of middle turbinated bone. 
Frontal sinus. 
. Nasal spine of frontal. 
. Nasal bone. 
. Nasal process of superior maxilla. 
Middle meatus of nose. 
Directed towards opening of antrum. 
Nasal surface of inferior turbinated bone. 
Inferior meatus of nose. 
. Anterior nasal spine. 
. Anterior palatine canal. 
2. Palatal process of superior maxilla. 
Palatal process of palate bone. 
24. 
25. 
26. 
2M. 
28. 
. Pterygo - spinous 
. Opisthion 
Posterior nasal spine. 
Hamular process of internal pterygoid plate. 
External pterygoid plate. 
Superior meatus of nose. 
Spheno-palatine foramen. 
ligament almost 
ossified to enclose a foramen. 
completely 
. Styloid process of temporal bone. 
. Alar spine of sphenoid. 
. Mastoid process. 
. Basion (mid-point of anterior border of foramen 
magnum), 
Internal auditory meatus. 
. Anterior condylic foramen. 
Leading into jugular foramen. 
(mid-point of posterior border of 
foramen magnum). 
. Groove for sigmoid sinus. 
. Opening of mastoid foramen. 
For lateral sinus and attachment of tentorium 
cerebelli. 
. Fossa for lodgment of cerebellar hemisphere. 
Internal occipital protuberance. 
to that of the under surface of the basicranial axis, where it forms the roof of the posterior 
nares. 
the superciliary ridges) to the occipital point posteriorly. 
The maximum length of the skull is measured from the glabella (a point between 
It is noteworthy that the 
maximum occipital point does not necessarily correspond to the external occipital pro- 
tuberance (inion). 
The greatest vertical height usually corresponds to the distance from 
the basion to the bregma (point of union of the sagittal with the coronal suture), though 
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