摘要
蒙古黄鼠松果腺主要由低电子密度的松果腺细胞和少量的胶质细胞、含色素细胞、神经突起及血管等组成。松果腺细胞内含有大量的线粒体、溶酶体、微丝、高尔基器、游离核糖体及中等量的光面和粗面内质网。纤毛、中心粒、突触带和致密芯小泡很少。松果腺细胞之间及胶质细胞之间存在电突触。最新被观察到的是大约有5%松果腺细胞内的线粒体产生“融合”现象,形成类似电突触的结构。神经突起可形成轴—轴突触,轴—树突触,并与松果腺细胞形成突触。
The distal part of pineal gland of the Mongolian ground squirrel was ultrastructurally studied. The gland was composed of low electron-dense parenchymal cells, among which glial cells, pigment cells, blood vessels and neural elements were occasionally interspersed. The pinealocytes contained numerous mitoehondria, lysosomes, microtubules, microfilaments, Golgi apparatus and free ribosomes, as well as less prominent profiles of rough-and smooth-surfaced endoplasmic reticula and some cilia, centrioles, synaptic ribbons and few subsurface cisterns. Some pinealocytes were vaeuolated. The content of the vacuoles released into the extracellular space by exocytosis could be observed. The gap junctions between pinealocytes were also observed, of particular interest was that many mitochondria 'fused together' and formed gap junction-like structure in about five percent pinealocytes. The pigment cell has a amorphous nucleus which contains many aggregated chromatin, its cell membrane has a few microvilli projecting into a central lumen, these features may indicated that this kind of cell differs either from the pinealocyte or astrocyte. There are axo-axonic synapses or axo-dendritic synapses between neuron processes or between neuron processes and pinealocytes.
出处
《实验生物学报》
CSCD
1990年第3期293-305,共13页
Acta Biologiae Experimentalis Sinica
基金
国家自然科学基金
关键词
蒙古黄鼠
松果腺
超微结构
Citellus dauricus. Pinealocytes. Ultrastructure.
