par Bretos Alarcon-Moraga, Marta 
Référence Archives de biologie, 91, 1, page (77-113)
Publication Publié, 1980
Référence Archives de biologie, 91, 1, page (77-113)
Publication Publié, 1980
Article révisé par les pairs
| Résumé : | The anterior epithelial sensorial zone of the otocyst is the first to become individualized and receives neuritic filaments from the anterior branch of the stato-acoustic nerve. The sensorial areas of the posterior ampulla, of the saccular macula and of the organ of Corti receive late neuritic filaments belonging to the posterior branch of the same nerve. These sensorial areas are further distinguished from the anterior sensorial zone by a less pronounced activity of the alkaline phosphatase. The two primordial neuroblastic groups of the stato-acoustic ganglion are distinguished by means of the alkaline phosphatase test, as the external group displays activity of this enzyme, while the internal group does not. Later on (at the stage of 10 1/2 days), the neuroblasts of the internal group manifest activity of the acid phosphatase. This type of neuroblast, large and with a rounded and voluminous nucleus, with its cytoplasm rich in RNA, will be found later in the two portions of the vestibular ganglion (the magno-cellular parts) and in the cochlear ganglion. The other type of neuroblast, with a less differentiated appearance, will be seen only in the vestibular ganglion (the parvicellular parts). The central neuritic ramifications of cochlear nature are the last to be discovered (at the stage of 11 1/2 days). |
