Figure 4. Posteroventral view of the anatomy around the right TPC in Orcinus orca, from hand dissection.
TB = tympanic bulla, pbs = peribullary sinus, cp = conical process of TPC, sp = sigmoid process of TPC, fvp = fibrous venous plexus, dfb = dorsal branch of the mandibular fat body. The white arrows point to fibers that tether the periotic bone to the periotic fossa of the basicranium (skull).