一般认为听骨链由槌、砧、镫三个听小骨组成杠杆．将声波由鼓膜传至前庭窗。砧骨长脚的末端变细、稍向内弯，构成豆状突并与镫骨头形成砧镫关节。近年有人认为豆状突是独立的第四听小骨。为此，该作者对取自尸体颞骨的４０份听骨标本进行了系列组织学切片观察，供体均无耳部炎 Generally believed that the ossicular chain by the mallet, anvil, 镫 three small bones composed of the lever. The sound waves from the tympanic membrane to the vestibular window. The ends of the incus long legs become thinner and slightly inwardly curved, forming a soma and forming an anvil joint with the tarsal bone. In recent years, some people think that legumes are the fourth independent hearing ossicles. To this end, the author of the cadaver bone taken from the body of 40 specimens were observed in a series of histological sections of the donor were no otitis