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Plica semilunare

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Occhio sinistro
Occhio sinistro: la plica semilunare si trova indicata a sinistra (Anatomia del Gray)

La plica semilunare dell'occhio umano è un vestigio della membrana nittitante che in altri mammiferi, negli uccelli, nei rettili e negli anfibi è molto più sviluppata e può essere distesa sull'occhio[1], a palpebra aperta, svolgendo una funzione di protezione e lubrificazione. Anche i muscoli ad essa associata sono vestigiali[2].

Fra i primati, solo la specie Calabar arctocebus possiede la plica semilunare perfettamente funzionante come membrana nittitante[3].

  1. ^ Owen, R., Comparative Anatomy and Physiology of Vertebrates, Londra, 1866–1868.
  2. ^ Darwin, Charles, The Descent of Man, and Selection in Relation to Sex, Londra, John Murray, 1871.
  3. ^ Montagna, W.; Machida, H.; Perkins, E.M., The skin of primates XXXIII.: The skin of the angwantibo, in American Journal of Physical Anthropology, vol. 25, n. 3, 1966, pp. 277-290, DOI:10.1002/ajpa.1330250307.

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Plica semilunare
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