OSTEOLOGY. 17 



The lateral borders show 



Thin edges for articulation with the frontal, squamous part of 

 the temporal and parietal. 

 Articulations, 10. 



Occipital, ethmoid, frontal, vomer, two parietal, two temporal 

 and two superior maxillary. 



THE TEMPORAL. 



The Temporal is important as forming the bony canals for the 

 reception of the organ of hearing, and is found forming parts of 

 the sides of the head, face and cranial cavity. 



It is divided into squamous and tuberous portions. 



The Squamous portion is flattened, oval in shape, forming 

 part of the lateral cranial wall, and is divided into external and 

 internal surfaces and a circumference. 

 The External Surface shows 



The zygomatic process, passing downward and forward, and 

 articulating with the zygoma; at its base is found the glenoid 

 cavity for the condyle of the inferior maxilla, limited in front and 

 behind by two marked elevations. 

 The Internal Surface shows 



The groove, which, with the parietal, forms the parieto-temporal 

 canal and depressions for cerebral convolutions. 



The circumference articulates with the frontal, parietal, sphenoid 

 and occipital. 



It is not united to the tuberous portion. 



The Tuberous portion passes forward and inward between 

 the occipital and parietal, and is divided into petrous and mastoid 

 processes. 



The petrous portion shows 



An anterior face in contact with. the parietal. 



A posterior face in contact with the occiput. 



An internal face which shows the internal auditory meatus, the 

 entrance of the seventh nerve to the internal ear, and the opening 

 of the aqueductus jallopii. 



An anterior border separating the cerebral from the cerebellar 

 cavities. 



The mastoid portion forms the base of the horizontal part of 

 the bone and shows 



