Section 480: The ampullae/cristae of the superior (asc), posterior (apc) and lateral (alc) semicircular canals are visible. The head of the malleus (m), lenticular process of the incus (l) and footplate (fp) of the stapes are present in the middle ear space (ME). The tympanic membrane has been artifactually ruptured. VIId - Tympanic segment of facial nerve.