DISSECTING MANUAL. 



process (temporal) running backward. The protuberance and 

 curved lines of the occipital will be described with the " pos- 

 terior aspect." [152] 



Temporal Fossa. This lies above the level of the zygomatic 

 arch, enclosed by the temporal crest. It is limited inferiorly ; 

 in front by the free border of the great wing of the sphenoid, 

 which bounds the spheno-maxillary fissure above; and behind 

 by a ridge (pterygoid) which crosses the sphenoid and squa- 

 mous temporal to become the anterior root of the zygoma. 

 Anteriorly a foramen (temporal canal) in the angle of the 

 raalar, behind its frontal and orbital processes, leads into the 

 orbit. [155] 



A process (zygomatic) springs from the front and lower part 

 of the squamous temporal by a broad attachment whose sur- 

 faces are horizontal; anteriorly it twists till its surfaces are 

 vertical and joins the temporal process of the malar, complet- 

 ing the zygomatic arch. Posteriorly its upper edge (posterior 

 root) runs back over the external auditory meatus as the supra- 

 mastoid crest, while its lower edge (anterior root) turns inward 

 as the pterygoid ridge (infra-temporal crest). On the under 

 side of the anterior root is a transverse ridge (articular emi- 

 nence), and over the outer side of this, at the divergence of the 

 roots, is a rounded prominence (tubercle). A conical process 

 (post-glenoid tubercle, or "middle root") descends from the 

 posterior root in front of the auditory meatus. [155] 



Behind the articular eminence is a hollow (glenoid fossa); 

 an oblique (Glaserian) fissure divides this into anterior artic- 

 ular and posterior non-articular parts; in the inner end of the 

 fissure is a scale of bone, and behind this is the orifice of the 

 canal of Huguier (iter chordae an terms). A process (alar 

 spine) of the sphenoid lies just internal to the articular portion 

 of the fossa. A flat (tympanic) plate forms the back of the 

 fossa; its lower edge is a crest (vaginal process) which splits 

 to enclose a descending rod (styloid process) of bone; its outer 

 edge (external auditory process) bounds the external auditory 



[8] 



