髁状突软骨纤维组织的超微结构观察

目的：深入了解髁突内部纤维组织的结构、走行方向、相互间关系及功能。方法：用扫描电镜和透射电镜观察了8例(16侧)家兔，体重为1．5—2．0kg，月龄6个月(动物由同济医学院中心实验室提供)。颞下颌关节髁状突剖面和切削面的超微结构。结果：在扫描电镜下，剖面呈现纵横交错的立体网状结构或者类似海绵状结构；切削处可见浅层的纤细网状纤维，这种纤维与泥土样物混合交织形成软骨的外层；在网状纤维的深层可见三种粗大的纤维平行于髁状突表面走行，其直径分别约为20nm、35nm和100nm。不同部位的纤维的排列、走向不尽相同。透射电镜下，髁状突内部纤维主要是有明显周期性横纹的I型胶原。结论：①髁状突表层存在一层纤细的网状纤维。②深层纵横交错的纤维呈海绵状结构具有传导和分散压力的作用。③纤维的粗细不同可吸收各种振动频率的力，形成了对作用于颞下颌关节各种力的有效缓冲垫。④透射电镜下纤维属I型胶原，说明髁状突软骨属纤维软骨。

Observation of Ultrastructure of Fibrous Tissues of Mandibular Condyle Cartilage

Objective:To explore the ultrastructure of the fibrous ti ssue of mandibular condyle by scanning electron microscopy (SEM) and transmissio n electron microscopy (TEM).Methods:The sections and pared surfaces of right mandibular condyles of 8 health chinese rabits were detected by SEM and the left condyle cartilage were observed by TEM.Results:The appearance of the sections of condyle cartilage on SEM was just lik e sponge.On the pared surface of condyles we have found a dense layer of fine fi bre,beneath the layer of fine fibre a layer of coarse fibre branch have been see n.On TEM the fibre in the condyle cartilage were regular strip.Conclu sions:Dense fine fibre mixed with gelatinous substances can protected the surface of condyle from rub.Coarse fibre branch and the sponge fibre layer can spread and conduct pressure. Regular strip on fibre can deduce that condyle cartilage is a fibrous cartilage.