乳頭肌（英語：Papillary muscle，也譯為乳突肌）是位於心臟心室內的肌肉，通過腱索附著在房室瓣（二尖瓣和三尖瓣）上[1]。乳頭肌約占心臟總質量的 10%[2]。
| Papillary muscle | |
|---|---|
 心臟右側內部，乳頭狀肌用紫色標記。 | |
 Diagram showing relations of opened heart to front of thoracic wall. Ant. Anterior segment of tricuspid valve. A O. Aorta. A.P. Anterior papillary muscle. In. Brachiocephalic artery (Innominate). L.C.C. Left common carotid artery. L.S. Left subclavian artery. L.V. Left ventricle. P.A. Pulmonary artery. R.A. Right atrium. R.V. Right ventricle. V.S. Ventricular septum. | |
| 標識字符 | |
| 拉丁文 | musculus papillaris |
| MeSH | D010210 |
| TA98 | A12.1.00.022 |
| TA2 | 4043、4066 |
| FMA | FMA:12154 |
| 格雷氏 | p.532 |
| 《肌肉解剖學術語》 [在維基數據上編輯] | |
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