opisthotic. Anteriorly the lower limb [B] (ramus suspen- 

 sorius) bears on the same aspect a very similar area [2] 

 for articulation with the pterygoid. Between the opisthotic 

 and pterygoid surfaces the conjoined rami form the lateral 

 wall and portions of floor and roof of the acustico-jugular 

 cavity. This area is impressed in front by a broad curved 

 sulcus (sulcus temporo-juyularis) [/>]. At the upper end of 

 this the medial border of the temporo-zygomatic surface is 

 deeply notched (inci.sura temporalis)^]. With the prootic 

 and pterygoid bones in p.»<ition this sulcus is converted into 

 the temporal canal above and jugular sinus below. In front 

 of the sulcus is an area [5] which articulates with the larger 

 quadrate surface on the prootic, the smaller quadrate sur- 

 face on that bone articulating with the spur which bounds 

 the temporal notch posteriorly. The pterygoid surface is 

 continued along the inner surface of the pedicle [6] which 

 latter also articulates, synchondrotically, by its apex with 

 the epipterygoid. Below the pterygoid surface the sus- 

 pensory ramus presents a smooth concave area (fades 

 ptcrtjyo-mandibulai-is) [0] from which portion of the 

 pterygo-mandibularis muscle arises. Forming the anterior 

 and inferior boundary of this area and continued along the 

 pedicle is a prominent sharp margin which separates it from 

 the anteroinferior surface of the ramus, this last, concave 

 from side to side, is continued round without interruption on 

 to the superior aspect of the otic ramus. The whole of the 

 temporo-zygomatic surface [8] so formed gives attachment 

 to muscles of mastication or has those muscles playing over 

 it. The continuation of this surface backwards is covered 

 by the parotic process of the squamosal. The greater 

 portion of the area so covered takes the form of a raised 

 quadrangular facet [<>). Behind this facet is that aspect 

 of the otic ramus which forms the roof [10] of the notch 

 between the two rami (iiieisura post-tympanica). The 

 suspensory ramus bears the condyle, above this posteriorly 



