體腔(英語:body cavity),是由中胚層包裹的、內部充滿液體的空間,分布在體壁消化道之間。體腔是三胚層動物在胚胎早期發育,原腸形成之後,在內、外兩胚層之間產生了中胚層,中胚層細胞通過不同的方式,在中胚層之間形成了體腔。

桑葚胚發育為囊胚的過程

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