THE SKULL AS A WHOLE. 



53 



and give attachment at their extremities to the stylo-hyoid ligaments. They 

 continue for a long time movable, as the cartilage which connects them 

 remains unossified till an advanced period of life. 



THE SKULL AS A WHOLE. 



Fig. 48. FRONT VIEW OP 

 THE SKULL OP A YOUNG 

 MAN OF ABOUT TWENTY 

 YEARS OP AGE. | 



Placed with the anterior 

 nasal spine and the middle 

 of the meatus auditorius 

 externus in the horizontal 

 plane. (In this, as in most 

 other figures, the figures and 

 letters of indication are 

 placed only on one side.) 1 t 

 frontal eminence ; 2, middle 

 of the lower part of the frontal 

 bone, or glabella, between the 

 superciliary eminences, and 

 above the transverse suture 

 of union with the nasal and 

 superior maxillary bones ; 

 3, supra-orbital ridge at its 

 middle to the inside of the 

 figure is the supra - orbital 

 notch ; 4, the orbit the 

 figure is placed on the orbital 

 plate of the sphenoid bone, 

 between the foramen lacerum. 

 orbitale and the spheno- 

 maxillary fissure ; 5, the 

 anterior opening of the 

 nares, within which are seen 

 in shadow the nasal crest of 

 the superior maxillary bones, 

 the vertical plate of the eth- 

 moid bone, and on each side 

 the turbinated bones ; 6, 

 superior maxillary bone at 

 the canine fossa above the 

 figure is the infra - orbital 



foramen ; 7, myrtiform, or incisor foramen ; 8, malar bone ; 9, symphysis menti and 

 median ridge; 10, body of the lower jaw, above the outer oblique ridge and the mental 

 foramen; 11, vertex, immediately over the coronal suture; 12, temporal fossa, at the 

 meeting of the frontal, parietal, temporal, and sphenoid bones; 13, zygoma; 14, mastoid 

 process ; 15, angle of the jaw ; 16, mental angle. In this skull there are fourteen teeth 

 in each jaw, the wisdom teeth having not yet appeared. 



J5 



THE SUTURES. 



The sutures of the skull are best distinguished when named from the 

 bones between which they lie, as, for example, occipito-parietal, occipito- 

 mastoid, fronto- ethmoid, parieto-sphenoid, &c. Those which occur in the 

 arch of the skull require more particular notice. The cranium is intersected 

 superiorly by three great serrated sutures, two of which, placed transversely, 

 correspond to the anterior and posterior margins of the parietal bones, while 

 the third lies in the middle line and passes between them. On each side 

 also there runs an irregular longitudinal line of suture from the malar to the 



