中央囊 central capsule亦称中囊。是原生动物放射虫类身体中心的多孔性膜状囊，是含有硅质或类几丁质性质的构造。包围中央囊部分称为外囊（extracopsulum）。
关节突关节肥大或滑囊囊肿可造成腰椎侧方和中央狭窄，这将对神经根造成压迫。
FJ hypertrophy or a synovial cyst can contribute to lateral and central lumbar stenosis, which can lead to impingement on the exiting nerve root.
注意每个巨噬细胞内含大量的组织孢浆菌，菌体中央呈蓝色细胞核，周围有一亮区，使细胞膜呈现囊状外观。
Note how each macrophage is filled with numerous small organisms. The organisms have a clear zone around a central blue nucleus which gives the cell membrane the appearance of a capsule.
结论放射状视神经切开治疗视网膜中央静脉阻塞所引起的黄斑囊样水肿和出血吸收有较好的疗效，对提高患者视力有一定的帮助。
Conclusion Radial optic neurotomy has therapeutic effect for macular edema and retinal hemorrhage in central retinal vein occlusion, it can improve the vision in some case.
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