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本文继光镜下观察了七—九月人胎听皮层发育这后,又在电镜下观察了其亚细胞的发育情况。结果:一、发育的一般情况:1、七月份:未见典型突触,线拉体呈棒状,可见少量嵴伸向囊腔内;2、八月份,可见到典型突触,但数量较少,突触类型主要为Ⅱ型对称性轴一树和轴一体突触.突触小泡为圆形、清亮、无核心小泡,但数量仅占突触前膨大体积的一小部分,且比较分散。线粒体的发育仍不典型,崎很短且稀疏;3、九月份,可见突触较八月份的明显增多,突触类型仍以Ⅱ型为主,偶可见到Ⅰ型非对称性突触,突触小泡明显增多,线粒体型态更趋典型。二、空触发育的体视学指标:1、突触的面数密度八—九月份分别为221.44个/μm~2、280.89个/μm~2;2、突触活性带膜面积八、九月份依次为0.019μm~2/μm~3、0.041μm~2/μm~3;3、突触膜厚度.八月份突触前后膜分别为13.40±0.58μm、13.75±0.96μm;九月份突触前后膜分别为13.91±0.74μm、21.04±2.37μm;突触间隙,八、九月份分别为14.26±1.43μm、15.34±0.98μm;4、突触小泡和线粒体的体积,八月份为8.56%和4.20%;九月份为11.20%和9.02%。
After observing the development of human cortex in July-September, we observed the development of the sub-cells under electron microscope. First, the development of the general situation: 1, July: no typical synapses, filamentous body was rod-shaped, showing a small ridge extending into the cysts; 2, August, you can see the typical synapses, but a small number , The synaptic type is mainly the type II symmetry axillary-axis and synaptic synaptic synaptic vesicles are round, clear, no core vesicles, but the number of only a small part of the presynaptic volume of enlargement, and compared dispersion. Mitochondrial development is still not typical, very short and sparse Kawasaki; 3, September, visible synapses significantly increased in August compared to August, the type of synaptic type is still mainly Ⅱ, I even see type Ⅰ asymmetric synapses, sudden Bullactomy significantly increased, more typical of mitochondrial patterns. Second, the air exposure to develop stereology indicators: 1, the synaptic face number density eight - September were 221.44 / μm ~ 2,280.89 / μm 2; 2, the synaptic active membrane area of eight, nine The months were followed by 0.019μm ~ 2 / μm ~ 3 and 0.041μm ~ 2 / μm ~ 3; 3. Synaptic membrane thickness. The synaptic thickness in August was 13.40 ± 0.58μm and 13.75 ± 0.96μm respectively. The anterior and posterior membranes were 13.91 ± 0.74μm and 21.04 ± 2.37μm respectively. The synaptic cleft was 14.26 ± 1.43μm and 15.34 ± 0.98μm in August and September respectively. 4. The volume of synaptic vesicles and mitochondria was 8.56% And 4.20% respectively; 11.20% and 9.02% in September.