title: [Ultrastructure of optic centers of the crayfish Artemia salina].
abstract: In electron microscopic investigations of the eyestalk of A. salina we were not able to find any elements of the most important neuroendocrine system X-organ--sinus gland which is typical of higher Crustaceans. The data obtained indicate that this system appears only in higher Crustaceans as the result of development of their central nervous system.
mesh_terms: D000818:Animals; D003400:Astacoidea / Q000033:anatomy & histology*; D008854:Microscopy, Electron; D009490:Neurosecretory Systems / Q000648:ultrastructure*
vernacular_title: Nekotorye dannye po ul'trastrukture opticheskikh tsentrov raka Artemia salina