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乳头肌功能不全是引起二尖瓣关闭不全的原因之一,而后者是临床上常见现象。现就乳头肌解剖生理功能及功能不全时的临床表现等问题加以讨论。乳头肌的解剖生理功能:乳头肌起源于心室壁,位于心内膜下,部分突出于心室腔,通过腱索与二尖瓣叶相连,与左心房、瓣环、瓣时、腱索及左室壁共同构成二尖瓣装置。左心乳头肌分为①前外乳头肌,起源于左室前侧壁,由左冠状动脉的回旋支与前降支供应血液;②后内乳头肌:起于左室后壁与室间隔连接处,其血液供应来自右冠状动脉的后降支及左冠状动脉的回旋支。解剖学特点是①富含浦氏纤维,先于心室肌激动;②血液供应比心室肌差,工作负荷远比心室肌大,氧耗量也大,极易出现缺
Papillary muscle dysfunction is caused by mitral regurgitation one of the reasons, while the latter is a common clinical phenomenon. Now on the anatomical physiological function of papillary muscle and dysfunction when the clinical manifestations and other issues to be discussed. Anatomical physiology of papillary muscles: Papillary muscles originate in the ventricular wall, located in the subendocardial, part of the prominent in the ventricular cavity, connected to the mitral valve leaflets through the chordae, and the left atrium, annulus, flap, chordae and left Wall together constitute the mitral valve device. Left heart papillary muscle is divided into ① anterolateral papillary muscles, originated in the anterior left ventricular wall, the left coronary artery by the supination and anterior descending artery blood supply; ② posterior papillary muscle: from the left ventricular posterior wall and ventricular septal connection The blood supply comes from the descending branch of the right coronary artery and the circumflex branch of the left coronary artery. Anatomy is characterized by ① rich fibers, premature ventricular myopathy; ② blood supply is worse than the ventricular muscle, the workload is much larger than the ventricular muscle, oxygen consumption is also large, prone to lack