【摘要】 通过电子显微镜观察了家蚕前胸腺超微形态的变化.在四龄龄初细胞基底膜很致密,细胞核不规则形.四龄中期以后.基底膜疏松,而呈纤维状,细胞核以细分枝伸向细胞全域.线粒体形状呈多态,马蹄状和环状线粒体明显增多.在四龄眠中和五龄吐丝期,细胞质中出现大型液胞和裂隙状液胞,粗面内质网和光面内质网一般是龄的后期比前期发达.更多还原

【Abstract】 The experiments were carried out to observe the ultrastructurc of prothoracic gland of the silkworm ( Bombyx mori) by clectron microscope. In early stage of 4th instar, thick basement membrane and irregularly round nucleus of the prothoracic gland cell were observed. While the basement membrane became loose, looking like fibrous materials and the nucleus uamificd extremely and the branched nuclei were broadly distributed in the cytoplasm after the middle stage of 4th instar. Meanwhile mitochondria of various shapes were detected, especially both the hoof-shaped and ring-shaped mitochondria increased markedly. There were large vacuolcs and crevice-like vacuolcs in the cytoplasm during molting stage of 4th instar and spinning stage of 5th instar. Both rough and smooth surfaced cndoplasmic rcticulum developed in the later period of each larval instar.更多还原