Feather growth begins with a thickening of the epidermis called the placode , which elongates into a tube ? the feather germ [ see illustration above ] 首先,表皮上的基板開始增厚,并拉長成一根管子,稱為羽芽(見上方羽毛的成長過程) 。
placodeとは意味:{名} : プラコード、板 placode meaning:[Medicine] n : a platelike thickening of embryonic ectoderm from which a definitive structure develops ear placode —see LENS PLACODE , OLFACTORY PLACODE placode en francais:n. placode (épaississement de tissu embryonnaire, étape dans la création d'un organe)placode перевод:1) _биол. плакода