Nuchal organ

The Nuchal organ (no). Source: doi:10.1007/s004350000022

The nuchal organ is a ciliated pit^[1] or groove present at the posterior end of the prostomium of annelid worms,^[1] some cephalopods,^[2] and other invertebrates.^[3]

Annelids only possess one nuchal organ, although the nature of the grooving may make it appear to be a pair of organs.^[4]

It may be involved in light detection,^[2] and may have a role on food detection and mating.^[5]

References

1. ^ ^{a b} Hessling, R.; Purschke, G. (2000), "Immunohistochemical (cLSM) and ultrastructural analysis of the central nervous system and sense …", Zoomorphology 120 (2): 65–78, doi:10.1007/s004350000022, http://www.springerlink.com/index/JVUVEH1D0HUXQCHF.pdf 
2. ^ ^{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 
3. ^ . http://www.iii.to.cnr.it/pubblicaz/JL_66_2/PENALVA.pdf. 
4. ^ 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 
5. ^ 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 

This annelid-related article is a stub. You can help Wikipedia by expanding it.v · stub. You can help Wikipedia by expanding it.v · Categories: Organs Annelid anatomy Mollusc anatomy Annelid stubs Animal anatomy stubs Wikimedia Foundation. 2010. Игры ⚽ Поможем решить контрольную работу Nuchal fibroma CV Murillo Look at other dictionaries: nuchal organ — Sense organ on upper side of head in many branchiopods. (Syn. neck organ) [Moore and McCormick, 1969]. (Class Branchiopoda): Sense organ on upper side of cephalon. (Syn. neck organ) [McLaughlin, 1980]. (Order Cladocera): Frontal organ… …   Crustacea glossary nuchal organ — (s). 1. (ANNELIDA: Polychaeta) A pair of ciliated sensory pits or slits in the head region. 2. (ARTHROPODA: Crustacea) In Branchiopoda, a sensory organ on the upper side of the cephalon. 3. (SIPUNCULA) Ciliated epidermal cells at the middorsal… …   Dictionary of invertebrate zoology nuchal caruncle — (ANNELIDA) A sensory organ on the prostomium, or extending posteriorly in the form of a ciliated ridge or groove …   Dictionary of invertebrate zoology neck organ — See: nuchal organ [Martin, 2005]. See: nuchal organ [McLaughlin, 1980]. (Order Cladocera): Nuchal organ [Stachowitsch, 1992] …   Crustacea glossary dorsal organ — Poorly understood glandular sensory structures (actually several different structures that may or may not be homologous) on the head of many crustaceans [Brusca and Brusca, 2002]. Thickened glandular area of hypoderm of dorsal surface just behind …   Crustacea glossary neck organ — see nuchal organ …   Dictionary of invertebrate zoology frontal organ(s) — Sensory cells on anterior surface of cephalon. (Syn. haft organ, frontal eye) [McLaughlin, 1980]. Sensory cells or setae on front surface of heads on some branchiopods, copepods, and decapods [Moore and McCormick, 1969]. (Order Cladocera):… …   Crustacea glossary Prostomium — (sometimes also called acron) is the first body segment in annelids worms. It is in front of (but does not include) the mouth, being usually a small shelf or lip like extension over the dorsal side of the mouth. It sometimes bears antennae and… …   Wikipedia Muscle — is the tissue of the body which primarily functions as a source of power. There are three types of muscle in the body. Muscle which is responsible for moving extremities and external areas of the body is called "skeletal muscle." Heart… …   Medical dictionary Bone — This article is about the skeletal organ. For other uses, see Bone (disambiguation) and Bones (disambiguation). For the tissue, see Osseous tissue. Drawing of a human femur Bones are rigid organs that constitute part of the endoskeleton of… …   Wikipedia 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”