Overview of Detailed Anatomy

     The following section is an atlas of selected structures of the posterior skull base with a few related orbital structures included. Small, well-defined structures are identified with arrows. Structures that cover a wider area are filled in with color. While most of the structures are easily seen on standard CT bone windows, a few are not well-defined. In particular, for most of the temporal bone, the boundaries between the squamous, petrous, tympanic, and mastoid portions are poorly seen, and except for the squamotympanic fissure, the indicated boundaries should be considered approximate. Similarly, there is no well-defined upper boundary of the pterygopalatine fossa or it junction with the inferior orbital fissure, but the indicated boundaries are considered reasonably accurate.