Isolated tympanic bulla of Mirounga leonina; generated by 3D reconstruction of the CAT of a CI specimen showing its internal and external anatomy. (A) Reconstructed ventral view, (B) reconstructed dorsal view, (C) reconstructed medial view, (D) reconstructed lateral view. CCAF, anterior foramen of canalis caroticus; CCLE, lateral extension of canalis caroticus; CCPF, posterior foramen of canalis caroticus; ET, Eustachian tube; MAE, meatus acusticus externus; STA, sulcus tubae auditivae. a, anterior; d, dorsal; l, lateral; m, medial; p; posterior.