Medial view of the turtle membranous labyrinth and eighth nerve stained for myelin with Sudan Black B (Rasmussen, 1961).A, B, arrowhead, Location of the papilla neglecta (PN) in the ventrolateral wall of the posterior utriculus, below the common crus (C), anterior to the posterior crista (PC), and posterior to the utriculosaccular foramen (*).Arrow points to the small branch of the posterior ampullary nerve innervating the PN. A, Anterior crista;B, basilar papilla; H, horizontal crista;L, lagena; S, sacculus;PC, posterior crista; U, utriculus. Scale bars: A, 1 mm; B, 250 μm.