On the other hand, lateral pterygoid muscle presents a superior fascicle originated in the horizontal part of the greater wing of sphenoid bone, including the infratemporal crest where it reach the sphenoidal tubercle (Rouviere & Delmas).
The vertical diameter was measured from the base, at level of infratemporal crest, to its apex or the inferior margin according to the morphological pattern presented.
In this study we considered that sphenoidal tubercle was present only if it was located in the anterior edge of the infratemporal crest (Testut & Latarjet).
This structure is located on the exocranial surface of the greater wing of the bone, specifically in relation to the infratemporal crest, separating the horizontal from the vertical portion of the greater wing.
The second criterion corresponded to the relationship with the infratemporal crest, that is, if the infratemporal spine was continuous or not with the infratemporal crest.
Regarding the relationship with the infratemporal crest, it was found that the infratemporal spine might appear as a continuation of the crest or as an isolated eminence (Fig.
With this classification defined in its three components of morphology, the relation with the infratemporal crest, and the relation with the pterygoid process, the distribution of the results are presented in Tables I, II and III.
Most of the spines found were related to the pterygoid process, either totally reaching the base, or following the lower edge of the orbital surface of the greater wing of the sphenoid bone (73 %), and they were less related to the infratemporal crest (34 %).
Besides the varied morphologies, relationship with the infratemporal crest, and relationship with the pterygoid process, there was also a high presence of the spine, either on the right side at 100 % or the left side at 96 %.
Another interesting finding is that the spine is often isolated from the infratemporal crest, thus differing from Testut's sphenoidal tubercle definition.
Relationship with infratemporal crest. A: A complete relation between the spine and the infratemporal crest is observed.