94 



THE SKELETON 



Tlie frontal (-(.nsists of two bones separated by a median vertical (metopic) suture. The 

 frontal eiuiiu nee is very conspicuous, but the superciliary ridges and frontal sinuses are wanting. 

 Tlie iKusil spine, which later becomes one of the most conspicuous features of this bone, is absent. 

 Tliere is no temijoral ridge. ... , 



The parietal is simiJy a quadrilateral lamina of bone, concave on its inner and convex on the 



Yui. 103.— Thk Temporal Bonk at I;irth. (Outer view.') 



S-/—-/A P^RO-SQUAMOUS SUTURE 

 ETROSAL 



POST-GLENOID TUBERCLE 

 GLASERIAN FISSURE 

 TYMPANIC ANNULUS 



,TYLO-MASTOiO FORAMEN 

 TYMPANO-HYAL 



CAROTID CANAL 



Fig. 104. — Temporal Bone at Birth. (Inner view.) 



— HIATUS FALLOPM 



— FLOCCULAR FOSSA 

 -■ AQUEDUCTUS VESTIBUL! 



INTERNAL AUDITORY MEATUS 



(juter surface. The parietal eminence, which indicates the spot in which the ossification of the 

 bone commenced, is large and conspicuous. The grooves for blood-sinuses, as in other crania! 

 bones, are absent. Each angle of the parietal is in relation with a foutanelle. As in the adult, 

 the anterior inferior angle of the bone is prolonged downwards towards the ali-sphenoid. 



The ethmoid consists of two lateral portions separated by the still cartilaginous ethmo- 



FiG. 105. — The Frontal at Birth. 



vomerine plate. The ethmoid cells are represented liy shallow depressions, and tlie uiuinate i)ro- 

 cess is undeveloped. 



The sphenoidal turbinals are two small triangular pieces of bone lying in the perichondrium 

 on each side oi" the cthmo-vomeriue plate near its junction with the pre-sphenoid. (Indicated by 

 the* in fig. 99.) 



