pronephrosn.

Brit.

/prəʊˈnɛfrɒs/, U.S.

/proʊˈnɛˌfrɑs/

Inflections: Plural pronephroi.

Forms: 1800s– pronephron Brit.

/prəʊˈnɛfrɒn/, U.S.

/proʊˈnɛfrɑn/ (rare), 1800s– pronephros.

Origin: A borrowing from Greek, combined with an English element. Etymons: pro- prefix², Greek νεϕρός.

Etymology: < pro- prefix² + ancient Greek νεϕρός kidney (see nephro- comb. form). In form pronephron after ancient Greek nouns in -ον . Compare German Urniere (1870 or earlier), Vorniere (1878 or earlier), Kopfniere (compare quot. 1877). Compare the parallel formations mesonephros n., metanephros n. Compare later nephron n.

Embryology and Zoology.

The most anterior (or superior) and first-developing part of the nephrogenic tissue of vertebrate embryos, which is functional only in the larvae of fishes and amphibians, and persists into adult life only in hagfishes and a few teleosts; = head kidney n. at head n.¹ Compounds 4. Cf. mesonephros n., metanephros n.

ΘΚΠ

the world > animals > animal body > general parts > substance or secretion and excretion > [noun] > anterior division of primitive kidney

head kidney1876

pronephros1877

1877 E. R. Lankester in Q. Jrnl. Microsc. Sci. 17 429 The pronephron (Kopfnieren) aborts, the pronephric duct becomes the oviduct; it is frequently called Müller's duct.

1881 F. M. Balfour Treat. Compar. Embryol. II. ii. xxiii. 601 That this body is..related functionally to the pronephros appears to be indicated..(3) by its enclosure together with the pronephridian stoma in a special compartment of the body cavity.

1887 Amer. Naturalist 21 588 Van Wijhe's view is..that the primitive Craniota had no pronephric duct, the pronephros opening outwards by a pore from the gland.

1908 Proc. Amer. Philos. Soc. 47 597 Mesonephros.—These tubules develop usually in the segments behind the pronephroi.

1930 H. G. Newth Marshall & Hurst's Junior Course Pract. Zool. (ed. 11) xvii. 484 In the chick the pronephros is..reduced to a mere vestige.

1997 G. S. Helfman et al. Diversity of Fishes iv. 46/1 Adult hagfishes have an anterior pronephros and a posterior mesonephros, but it appears to be the mesonephros that is the functional kidney.

This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022).

单词	pronephros
释义	pronephrosn. Brit. /prəʊˈnɛfrɒs/, U.S. /proʊˈnɛˌfrɑs/ Inflections: Plural pronephroi. Forms: 1800s– pronephron Brit. /prəʊˈnɛfrɒn/, U.S. /proʊˈnɛfrɑn/ (rare), 1800s– pronephros. Origin: A borrowing from Greek, combined with an English element. Etymons: pro- prefix², Greek νεϕρός. Etymology: < pro- prefix² + ancient Greek νεϕρός kidney (see nephro- comb. form). In form pronephron after ancient Greek nouns in -ον . Compare German Urniere (1870 or earlier), Vorniere (1878 or earlier), Kopfniere (compare quot. 1877). Compare the parallel formations mesonephros n., metanephros n. Compare later nephron n. Embryology and Zoology. The most anterior (or superior) and first-developing part of the nephrogenic tissue of vertebrate embryos, which is functional only in the larvae of fishes and amphibians, and persists into adult life only in hagfishes and a few teleosts; = head kidney n. at head n.¹ Compounds 4. Cf. mesonephros n., metanephros n. ΘΚΠ the world > animals > animal body > general parts > substance or secretion and excretion > [noun] > anterior division of primitive kidney head kidney1876 pronephros1877 1877 E. R. Lankester in Q. Jrnl. Microsc. Sci. 17 429 The pronephron (Kopfnieren) aborts, the pronephric duct becomes the oviduct; it is frequently called Müller's duct. 1881 F. M. Balfour Treat. Compar. Embryol. II. ii. xxiii. 601 That this body is..related functionally to the pronephros appears to be indicated..(3) by its enclosure together with the pronephridian stoma in a special compartment of the body cavity. 1887 Amer. Naturalist 21 588 Van Wijhe's view is..that the primitive Craniota had no pronephric duct, the pronephros opening outwards by a pore from the gland. 1908 Proc. Amer. Philos. Soc. 47 597 Mesonephros.—These tubules develop usually in the segments behind the pronephroi. 1930 H. G. Newth Marshall & Hurst's Junior Course Pract. Zool. (ed. 11) xvii. 484 In the chick the pronephros is..reduced to a mere vestige. 1997 G. S. Helfman et al. Diversity of Fishes iv. 46/1 Adult hagfishes have an anterior pronephros and a posterior mesonephros, but it appears to be the mesonephros that is the functional kidney. This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022). < n.1877
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