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在光镜下对３～９月胎儿髁状突矢状切片作了观察和定点测定。结果显示，胚胎３月时，髁突已分化成纤维层、增殖层和软骨层。髁突中份的增殖层向下凹陷形成血管束，直通髓腔。随着月龄的增长，纤维层逐渐增厚，增殖层渐薄，且以７月龄时变化最明显。软骨层虽有减少，仍构成髁突大部。血管束也随月龄逐渐变细，７月时变为３～４条、更细。血管束的形成利于髁突的营养供应，其变化与髁突的生长发育相适应。
The sagittal sagittal sagittal sections of 3 ~ 9 months were observed under the light microscope and fixed point. The results showed that condyles had differentiated into fibrous, proliferative and cartilage layers at embryonic day 3 months. The condylar middle part of the proliferative layer down to form a vascular bundle, straight through the medullary cavity. With the increase of age, the fibrous layer gradually thickened and the proliferative layer became thinner, with the most obvious change at 7 months of age. Although the cartilage layer decreased, still constitute the majority of condyle. Vascular bundle is also tapered with age, in July into 3 to 4, more detailed. The formation of vascular bundles is conducive to the nutritional supply of condyle, its changes and condyle growth and development to adapt.