Bones of the Skull. 



Margo 

 parietalis 



Squama temporally 



Facies temporalis 



Sulcus a. temporalis 

 mediae 



Incisura parietalis 



Linea temporalis 



Fossa mastoidea 



Spina supra 

 meatuin 



Hemains of the 



sutura squamoso- 



mastoidea 



Foramen mastoideum 



Pars mastoidea 



Margo 

 sphenoidalis 



Processus mastoideus 



Fissura tympanomastoidea 



Meatus acusticus externus 



Processus 

 zygomaticus 



- Apex pyramidis 

 Tuberculum articulare 



Fossa mandibularis 



Processus 

 inferior tegminis tympani 



Fissura petrotympanica [Glaseri] 

 Vagina processus styloidei 

 Processus styloideus 



Pars tympanica 



7. Right temporal bone, os temporale, from without. 



The paired OS temporale or temporal bone (cf. also Tigs. 815, 55, 56, 59, 60 and 



63 66) lies between the occipital bone and the sphenoid bone, helping to form both the base 

 of the skull and its lateral wall. Each bone is divisible in the adult into four parts; the 

 squama temporalis, pars mastoidea, pars petrosa and pars tympanica. Around the meatus 

 acusticus externus (external auditory canal) which opens lateralward through the oval porus 

 acusticus externus, these parts are so arranged that the squama is directed upward, the pars 

 mastoidea backward, the pars tympanica forward and downward and the pars petrosa, median- 

 ward and forward. 



The squama temporalis (see also Figs. 810, 1215, 55, 56, 59, 60 and 6366) 

 consists essentially of a vertical plate, the free approximately semi -circular border of which is 

 serrated only in its anterior inferior portion, being otherwise bevelled from within ; the anterior 

 part of the margin , margo sphenoidalis , unites with the large wing of the sphenoid bone to 

 form the sutura sphenosquamosa, the posterior, mar go parietalis, with the margo spuamosus 

 oss. parietalis to form the sutura squamosa. The lateral surface, fades temporalis (for the 

 m. temporalis), is smooth ; projecting from tho lower part of this surface in front of the external 

 auditory canal is the processus zygomalicas (for the Kg. temporomandibulare ; m. masseter) 

 with two roots of origin ; it passes at firso horizontally outward, then, turning at a right angle, 

 forward (see also Figs. 9 and 10). Between the two roots, directed downward and covered 

 with cartilage in front, lies the fossa mandibularis (0. T. glenoid cavity) with the fades 

 articularis , limited in front by the frontally placed tuber culum articulare, the latter being 

 covered by cartilage. On the out r surface of the squama temporalis is seen, passing upward 

 in the posterior part, the sulcus arleriae temporalis mediae (for the a. temper, med.). Kunning 

 out also from the posterior extremity of the zygomatic process is a ridge, the linea temporalis, 

 which curves backward to bee-onie continuous with the linea temporalis inferior of the parietal 

 bone. The medial surface o/ the squama, fades cerebralis (see Fig. 8), presents well marked 

 juira cerebralia and impreaSiones digitatae as well as a deep sulcus arteriosus ; besides, the 

 thin spot corresponding id the fossa mandibularis often presents a bulbous projection. 





