58 



Bones of the Skull. 



Fossa glandulae lacrimalis 



Ala magna ossis sphenoidalis 

 Os zygomaticum 

 Foramen zygomaticoorbitale 



Fissura orbitalis inferior 



\ Sulcus infraorbitalis 



\ Corpus maxillae 



* r ** 



Fissura orbitalis 

 superior 



Foramen rotundum 



Canalis pterygoidens 



Sinus maxillaris 



71. Right Orbital Cavity, Orbita, lateral wall, from the left. 



(The medial part of the orbit has been removed by an approximately sagittal section.) 



The upper wall of the orbit, paries superior, (see also Figs. 69 and 70) is horizontal 

 and is formed by the pars orbitalis oss. frontalis and the ala parva oss. sphenoidalis; it is 

 smooth and slightly concave. A part of the sutura spheno frontalis is visible between these 

 two bones. In addition, it contains in front and lateralward the fossa glandulae lacrimalis, 

 in front and medianward the fovea and occasionally, lateral from this, the spina trochlearis. 



The lateral wall, paries lateralis, (see also Figs. 69 and 70) is vertical and inclined 

 from in front and lateralward obliquely downward and medianward. It is composed of the 

 facies orbitalis oss. zygomatici, the facies orbitalis of the ala magna oss. sphenoidalis, partly 

 also of the medial surface of the processus zygomaticus oss. frontalis. Between these bones 

 run the sutura sphenozyyomatica (between os zygomaticum and ala magna oss. sphenoidalis), 

 the sutura zyfjomatico frontalis (between processus frontosphenoidalis oss. zygomatici and 

 processus zygomaticus oss. frontalis), as well as the sutura spheno frontalis (between ala magna 

 oss. sphenoidalis and pars orbitalis oss. frontalis). Here can be seen also the single or double 

 foramen zygomaticoorbitale which leads to the facial surface and to the fossa temporalis, and 

 the fissura orbitalis superior (0. T. sphenoidal fissure or foramen lacerum anterius). The 

 latter is found on the boundary between the lateral and the superior wall and occupies the 

 whole medial half of the same; it is narrow and acute-angled lateralward and broadens 

 medianward, usually suddenly, to terminate there, rounded off, below the foramen opticum; 

 it leads into the skull cavity, but is, in its larger part, closed by tough connective tissue 

 and periosteum. 



