最終更新日：2025/11/30
(biology) The first part of the urogenital system to be differentiated in a vertebrate embryo, which functions as a simple excretory organ in simpler forms, serves as a provisional kidney in some fish and amphibians, and only appears as a temporary embryonic structure in reptiles, birds, and mammals.
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pronephron
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元となった辞書の項目
pronephron
名詞
(biology)
The
first
part
of
the
urogenital
system
to
be
differentiated
in
a
vertebrate
embryo,
which
functions
as
a
simple
excretory
organ
in
simpler
forms,
serves
as
a
provisional
kidney
in
some
fish
and
amphibians,
and
only
appears
as
a
temporary
embryonic
structure
in
reptiles,
birds,
and
mammals.
日本語の意味
脊椎動物の胚発生過程において、尿生殖系の最初の部分として分化する構造。簡単な排泄器官として機能し、一部の魚類や両生類では暫定的な腎臓の役割を果たす。爬虫類、鳥類、哺乳類では一時的な胚性構造として現れる。
意味（1）
(biology)
The
first
part
of
the
urogenital
system
to
be
differentiated
in
a
vertebrate
embryo,
which
functions
as
a
simple
excretory
organ
in
simpler
forms,
serves
as
a
provisional
kidney
in
some
fish
and
amphibians,
and
only
appears
as
a
temporary
embryonic
structure
in
reptiles,
birds,
and
mammals.
（ plural ）
