外套膜(英語:Mantle;拉丁語:Pallium,形容詞形式:pallial,本義指長袍),或簡稱作套膜,是軟體動物、腕足動物及被囊動物的重要解剖部分,由其背側的體壁向下褶與伸展形成,經常包裹整個內臟團;而內臟囊與外套膜之間的空腔即為外套膜腔或外套腔(Mantle cavity)[1]。外套腔是許多器官的開口,如肛門、鰓孔、腎孔、生殖孔等[2]。
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Loligo_vulgaris.jpg/640px-Loligo_vulgaris.jpg)
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e8/Giant_clam_komodo.jpg/640px-Giant_clam_komodo.jpg)
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