mid.gut

n.（名詞）
The middle section of the digestive tract in a vertebrate embryo from which the ileum, jejunum, and portions of the duodenum and colon develop.Also called mesenteron
中腸：脊椎動物胚胎中消化道的中間部分，回腸、空腸、部分十二指腸和節(jié)腸均屬此部位也作 mesenteron
The middle portion of the digestive tract of certain invertebrates, such as arthropods, lined with an enzyme-secreting tissue and serving as the main site of digestion and absorption.
中央管：某些無脊椎動物，如節(jié)肢動物消化管的中央部分，上面布有分泌酶的組織，為消化和吸收的主要部位