Between the posterior wall of the external acoustic meatus and the posterior root of the zygomatic process is the area called the suprameatal triangle ( Macewen ), or mastoid fossa, through which an instrument may be pushed into the tympanic antrum.
2.
Its inner end is closed, by the tympanic membrane which originates from the tympanic sulcus; the upper limit of its outer orifice is formed by the posterior root of the zygomatic process, immediately below which there is sometimes seen a small spine, the " suprameatal spine ", situated at the upper and posterior part of the orifice.
3.
Omomyids as a group also lack most of the derived specializations of living tarsiers, such as extremely enlarged orbits ( " Shoshonius " is a possible exception ), a large suprameatal foramen for an anastomosis between the posterior auricular and middle meningeal circulation ( again, " Shoshonius " is a possible exception, but the contents of the foramen in this extinct taxon are unknown ), and extreme postcranial adaptations for leaping.
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