Breathnach [3] states that a projection, more or less prominent on the posterior edge of the lateral pterygoid plate, a little way down, may mark the anterior attachment of a "pterygospinous" ligament extending to the base of the sphenoidal spine. The ligament maybe short, fastened higher up on the plate or two ligaments, long and short, may be present: ossification may extend someway into these, so that a bony bar may be present here.
[10] reported that a complete osseous bar, arch, or lamina connecting the posterior border of lateral lamina of pterygoid process and sphenoidal spine existed in 6 of the 100 human dry skulls and 1.85% in cadavers.
These were evaluated in the area between the following limits, which were marked on MPRs prior to the evaluation of the series of slices: the sagittal line through the medial pterygoid plate, the transverse line through the posterior border of the jugular foramen; the oblique line drawn from the posterior border of the medial pterygoid plate obliquely through the
sphenoidal spine.