腰方肌（Quadratus lumborum）位於腹腔的後部。在腹腔肌肉裏面位置最深，常被指為腰肌。形狀是四邊形。功能為腰椎側彎以及防止腰椎從另一邊側彎。
 | 這是一篇關於肌肉的小作品。您可以透過編輯或修訂擴充其內容。 |
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