title: [Morphology of nitric oxide synthase positive neurons in the cerebellar cortex of midanaphase human fetus].
abstract: OBJECTIVE
  To investigate the growth and development of nitric oxide synthase (NOS)-positive neurons in the cerebellum of human fetus in the midanaphase.
  
  
  METHODS
  The positive expression of the NOS-positive neurons in the cerebellum of midanaphase human fetus was observed by immunohistochemistry.
  
  
  RESULTS
  By the sixth to seventh month of gestation, NOS-positive neurons were seen in the ependymal layer of the cerebellum. The nucleus was oval-shaped and the neurons had short and small processes. By the eighth to ninth month, NOS-positive neurons were found in the central layer of the cerebellum and the nucleus was round-, oval-, or fusiform-shaped; meanwhile, the neurons grew larger in size with richer cytoplast and heavier staining. The beaded nerve fibers reached the marginal layer and the layer became thickened on the tenth month, which generally was composed of 5 to 6 layers of NOS-positive neurons that were tightly aligned. Some NOS-positive neurons were in smaller size with the cell body and the nerve fibers grew well.
  
  
  CONCLUSIONS
  Nitric oxide generated by NOS of the NOS-positive neurons in the cerebellum plays an important role in the differentiation, proliferation, and migration of neurons and gliacytes.
authors.affiliation: Department of Pathology, Wannan Medical College, Wuhu, Anhui 241002, China. zhenglr2001@yahoo.com.cn
authors.forename: Lan-Rong
authors.initials: LR
authors.lastname: Zheng
authors.forename: Xiao-Mei
authors.initials: XM
authors.lastname: Huang
authors.forename: Qian
authors.initials: Q
authors.lastname: Gu
authors.forename: Jin-Gui
authors.initials: JG
authors.lastname: Shao
mesh_terms: D002525:Cerebellar Cortex; D005333:Fetus / Q000502:physiology*; D006801:Humans; D007150:Immunohistochemistry; D009412:Nerve Fibers; D009474:Neurons / Q000166:cytology* / Q000378:metabolism*; D009569:Nitric Oxide / Q000378:metabolism; D019001:Nitric Oxide Synthase / Q000378:metabolism*; D052248:Nitric Oxide Synthase Type I
chemical_list: D009569:Nitric Oxide; C496320:NOS1 protein, human; D019001:Nitric Oxide Synthase; D052248:Nitric Oxide Synthase Type I