38 



BOXES OF THE HEAD. 



inwards and overlapping tlie corresponding bevelled edge of the parietal 

 bone. But in front the border is thicker, looks directly forwards, and 

 is serrated for articulation with the great wing of the sphenoid bone. 



Fis. ?.r 



J: ^Sk 



Fig. 3.3.— Right Tempo- 

 ral Bone from the 

 outside. (a. t.) i 



1, tlie external surface 

 of the squamous part ; 2, 

 the zygoma ; 3, the mas- 

 toid part ; 3 X , the mas- 

 toid process ; 4, the arti- 

 cular part of the glenoid 

 fossa ; 5, the articular 

 eminence at the root of the 

 zygoma, and above it the 

 tubercle ; 6, fissure of 

 (xlaser ; 7, the tympanic 

 jilate forming the postei'ior 

 non-articular part of the 

 glenoid. fossa, terminating 

 ))ehind in the vaginal pro- 

 cess ; 8, the meatus audi- 

 torius externus ; 9, the 

 auditory process ; 10, the 

 styloid process ; 13 x , the 

 mastoid foz'amen. 



The outer surface is in its greatest extent vertical, with a slight con- 

 vexity, and forms part of the temporal fossa. From its lowest part a 

 long process, the zygoran, takes origin. 



FiK. 34. 



Fig. 34.— The Right Tem- 

 poiUL Bone from the 

 inner side. (A. T.) I 



The indications where 

 marked are the same as in 

 the preceding figure. 11, tlie 

 inner or cerebral surface of 

 the squamous portion ; 1 1 x , 

 the squamous edge, 12, inner 

 surface of the mastoid jjor- 

 tion ; 13, the sigmoid groove 

 of the lateral sinus — the 

 figure is placed at its upper 

 part, and close to the mastoid 

 foramen ; 14, the apex of the 

 petrous bone ; 15, the meatus 

 auditorius internus ; 16, the 

 scale of bone covering the 

 aqueduct of the vestibule ; 

 17, is above the aquetluct of 

 the cochlea ; IS, the superior 

 petrosal groove ; 19, the 

 eminence of the superior 

 semicircular canal ; 20, the 

 hiatus Fallopii. 



The zijrjomn, or zygomatic process, is connected with the lower and 

 €uter part of the sijuamous portion, and is of considerable breadth at 

 its base, which projects outwards. It then becomes narrower, and is 



