The basilar papilla of the lizard Calotes versicolor contains two different types of sensory cells. The ventral part of the organ is populated by the short-haired type A sensory cells whereas the dorsal part is populated by the long-haired type B sensory cells. The type A sensory cells are all unidirectionally oriented away from the cochlear nerve while the type B cells are bidirectionally oriented towards the midline of the organ. The ventral part of the basilar papilla, that is the type A sensory cell population, is covered by a tectorial membrane. Close to the base of the stereocilia in the sensory hair bundle a connective zone is seen linking them together. At the top of the kinocilium thin filaments are seen bridging the gap to the closest stereocilia, thus linking the kinocilium to the rest of the sensory hair bundle. Fine filaments are also seen linking the bulbous tip of the type A sensory cell kinocilium with the tectorial membrane.

Keywords:
Lizard, Basilar papilla, Auditory system, Calotes versicolor
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© 1974 S. Karger AG, Basel
1974
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