| 词汇 | pronephros |
| 释义 | pronephros noun[ C ] anatomy specializeduk /prəʊˈnef.rəs/ us /proʊˈnef.rəs/pluralpronephroiuk /prəʊˈnef.rɔɪ/ us /proʊˈnef.rɔɪ/ a structure found in a human embryo(= a baby before it is born) that is part of the structure that becomes the kidney, but disappears before birth, or a similar organ in the embryos of mammals, birds, and reptiles: In the embryo, the kidneys develop from three overlapping sequential systems; the pronephros, the mesonephros, and the metanephros. The pronephros undergoes rapid atrophy and disappears. Compare mesonephros metanephros an organ similar to a kidney found in some adult fish: The pronephros is the functional kidney in only the lowest of vertebrates. The pronephros is a temporary structure, and was present soon after hatching. The pronephros appears in the fourth week of development. The pronephros functions in the larval stages of amphibians and fish, but not in mammals after birth. Substances & structures in the body abductor accessorius ACL actin adductor fundus funiculus fusiform glomerular glomerulus myosin navicular neuroendocrine neurohormonal neurohormone tendinous tendinum tendo tensor Th Related wordpronephric |
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