X organn.

Brit.

/ˈɛks ˌɔːɡ(ə)n/, U.S.

/ˈɛks ˌɔrɡ(ə)n/

Forms: Also x organ and with hyphen.

Etymology: After German organ X, X-organ (B. Hanström 1931, in Zeitschr. f. Morphol. u. Ökol. d. Tiere XXIII. 200, 202), so called because indicated by the letter X in a diagram published by G. Bellonci 1882, in Mem. dell' Accad. Sci. dell' Ist. di Bologna III. 419 ff.

Zoology.

A group of neurosecretory cells in the eye-stalk of some crustaceans, one of the secretions of which inhibits the production of moulting hormone by the Y organ.

ΘΚΠ

the world > animals > invertebrates > phylum Arthropoda > class Crustacea > [noun] > member of > parts of > eye-stalk > group of cells in

X organ1938

1938 Arkiv för Zoologi XXX B. viii. 1 When investigating the nervous system and the organs of sense of the crustaceans, Hanström found (1931–1935) two organs which he called the blood gland (the sinus gland) and the X-organ.

1959 W. Andrew Textbk. Compar. Histol. xiii. 513 There is a definite pathway..by which the axons of the nerve cells of the x-organ travel to the sinus gland.

1975 Sci. Amer. Feb. 74/1 The eyes of crabs are mounted on movable stalks. The stalks also house a neuroendocrine unit called the X-organ sinus-gland complex, which secretes a hormone that causes the pigments to disperse within the chromatophores.

This entry has not yet been fully updated (first published 1986; most recently modified version published online December 2021).

单词	x organ
释义	X organn. Brit. /ˈɛks ˌɔːɡ(ə)n/, U.S. /ˈɛks ˌɔrɡ(ə)n/ Forms: Also x organ and with hyphen. Etymology: After German organ X, X-organ (B. Hanström 1931, in Zeitschr. f. Morphol. u. Ökol. d. Tiere XXIII. 200, 202), so called because indicated by the letter X in a diagram published by G. Bellonci 1882, in Mem. dell' Accad. Sci. dell' Ist. di Bologna III. 419 ff. Zoology. A group of neurosecretory cells in the eye-stalk of some crustaceans, one of the secretions of which inhibits the production of moulting hormone by the Y organ. ΘΚΠ the world > animals > invertebrates > phylum Arthropoda > class Crustacea > [noun] > member of > parts of > eye-stalk > group of cells in X organ1938 1938 Arkiv för Zoologi XXX B. viii. 1 When investigating the nervous system and the organs of sense of the crustaceans, Hanström found (1931–1935) two organs which he called the blood gland (the sinus gland) and the X-organ. 1959 W. Andrew Textbk. Compar. Histol. xiii. 513 There is a definite pathway..by which the axons of the nerve cells of the x-organ travel to the sinus gland. 1975 Sci. Amer. Feb. 74/1 The eyes of crabs are mounted on movable stalks. The stalks also house a neuroendocrine unit called the X-organ sinus-gland complex, which secretes a hormone that causes the pigments to disperse within the chromatophores. This entry has not yet been fully updated (first published 1986; most recently modified version published online December 2021). < n.1938
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