It opens in front into that portion of the tympanic cavity which is known as the attic or epitympanic recess.
2.
The zygomatic arches are prominent ( behind the eyes ); the paroccipital processes elongated ( downward-pointing processes behind the jaw-joints ); and the epitympanic sinuses open into the temporal fossae ( cavities above the ear holes ).
3.
Shared characters that unite diprotodontians include diprotodonty ( where there are just two lower incisors ), a special epitympanic wing of the squamosal bone in the braincase, and the presence of an extra band of fibres ( termed the fasciculus aberrans ) that connect the two hemispheres of the brain.
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