Nuchal organ

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The Nuchal organ (no). Source: [1]

The nuchal organ is a ciliated pit[2] or groove present at the posterior end of the prostomium of annelid worms,[2] some cephalopods,[3] and other invertebrates.[4]

Annelids only possess one nuchal organ, although the nature of the grooving may make it appear to be a pair of organs.[5]

It may be involved in light detection,[3] and may have a role on food detection and mating.[6]


  1. ^ Hessling, R.; Purschke, G. #X. 0. F. ;N. (2000). "Immunohistochemical (cLSM) and ultrastructural analysis of the central nervous system and sense organs in Aeolosoma hemprichi (Annelida, Aeolosomatidae)". Zoomorphology. 120 (2): 65. doi:10.1007/s004350000022. 
  2. ^ a b Hessling, R.; Purschke, G. (2000), "Immunohistochemical (cLSM) and ultrastructural analysis of the central nervous system and sense …" (PDF), Zoomorphology, 120 (2): 65–78, doi:10.1007/s004350000022 
  3. ^ a b Parry, M. (2000), "A description of the nuchal organ, a possible photoreceptor, in Euprymna scolopes and other cephalopods", Journal of Zoology, 252 (2): 163–177, doi:10.1111/j.1469-7998.2000.tb00612.x 
  4. ^ (PDF)  Missing or empty |title= (help)
  5. ^ Purschke, G.; Wolfrath, F.; Westheide, W. (1997), "Ultrastructure of the nuchal organ and cerebral organ in Onchnesoma squamatum (Sipuncula, Phascolionidae)", Zoomorphology, 117: 23, doi:10.1007/s004350050026 
  6. ^ Schlötzer-schrehardt, U. (1986), "Ultrastructural investigation of the nuchal organs ofPygospio elegans (Polychaeta). I. Larval nuchal organs", Helgoländer Meeresuntersuchungen, 40 (4): 397, doi:10.1007/BF01983820