Embryonic developmental study on inner ear of Columba livia domestica (the early, intermediate stages)
作者： Ragaa El-Balshy , Abd El-Hady Si , El-Hady M M , El-Sayed Sh
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摘要: The present study deals with the embryonic development of early and intermediate stages Columba livia domestica inner ear or membranous labyrinth (10, 15, 20, 22, 26,30,33,36 47 mm total body length). During (10 stage), neuroepithelium ventral rhompencephalon evaginates laterally to form an ectoderm thickening, otic placode. latter invaginates forming otocyst that subsequently gives all other components labyrinth. surrounding mesenchyme is origin cartilaginous capsule ear. endolymphatic duct first appeared structure in 15 stage, followed by cochlear (in 22 stage) finally three semicircular ducts. begin 26 stage end .The contains sensory organs; macula ( utriclus , sacculus) crista ampullaris canals ) basilar papillae duct; not only for sense hearing but also equilibrium ,stability balance. organs (36 stages) showed no differentiation hair supporting cells. In (47 has undergone a considerable its structure. It consists dorsal vestibular part including two connecting sacs (utriculus (the duct). Keywords : Columba, Embryo, Early, Intermediate Stages, Inner Ear Development.
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