x-organ
Groups of neurosecretory cells situated in each eyestalk producing a moult-inhibiting hormone [Ingle, 1983].
Site of secretion of molt-inhibiting and other hormones. Located in eyestalks of most decapods or cephalon of sessile-eyed crustaceans. Also referred to as paired frontal organ in Anostraca [McLaughlin, 1980].
(Order Anostraca):
Neurosecretory structure in dorsal region of head; innervated by brain [Stachowitsch, 1992].
(Order Decapoda):
Neurosecretory structure in eyestalk (ocular peduncle). Secretes hormones that inhibit molting and are involved in gonad development and metabolism. In shrimp-like (natantian) decapod one may distinguish medulla terminalis X-organ and sensory pore X-organ [Stachowitsch, 1992].

Crustacea glossary. . 2011.

Look at other dictionaries:

  • X-Organ — X Organ,   Ansammlung neurosekretorischer Zellen (Sinnespapillen) in den Augenstielen höherer Krebse, die ein häutungshemmendes Peptidhormon (englisch moult inhibiting hormone; Abkürzung MIH) produzieren, das aus der Sinusdrüse in die Hämolymphe… …   Universal-Lexikon

  • x-organ — 1. (ARTHROPODA: Crustacea) In Decapoda, a neuro secretory organ situated in the eye stalk, and the cephalon of sessile eyed crustaceans; frontal organs in Anostraca; see organ of Bellonci, frontal eye complex, frontal organ. 2. (KINORHYNCHA) In… …   Dictionary of invertebrate zoology

  • X organ — …   Useful english dictionary

  • medulla terminalis X-organ — (Order Decapoda): X organ [Stachowitsch, 1992] …   Crustacea glossary

  • sensory pore X-organ — (Order Decapoda): X organ [Stachowitsch, 1992] …   Crustacea glossary

  • medulla X-organ — См. MTGX …   Dictionary of invertebrate zoology

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