[The vestibular apparatus of quail embryos in an experiment on the Kosmos-1129 biosatellite].
The light microscope was used to study serial sections of labyrinths of quail embryos incubated and reared during 12 d orbiting of Cosmos 1129. On recovery the embryos were aged 9, 11.5 and 12 days. No significant deviations in the development of the vestibular apparatus in flight species were noted as compared to the controls. Given this and our experimental data about in-space development of fish and amphibians we may deduce that hypo-g does not exert a noticeable altering effect on the vestibular embryogenesis. Nevertheless, it should be pointed out that in all otolith organs and semicircular channel ampules of the flight embryos cup-form neural endings innervating type I sensory cells were markedly swollen in contrast to the control. Earlier swollen cup-form nerve endings have been found in one adult rat after 7 days of space flight aboard Cosmos 1667. However, exposure in space does not bring about a substantial swelling of bud-like nerve endings which contact type II sensory cells. Thus, a conclusion may be drawn that spaceflight factors are liable to produce shifts in the type I sensory cell--cup-form nerve ending unit but they do not affect type II sensory cell--bud-like nerve ending unit to the extent when effects can be identified by light microscopy.
D V
DV
Lychakov
E V
EV
Il'inskaia
O A
OA
Dadasheva
T S
TS
Gur'eva
D000818:Animals; D003370:Coturnix / Q000196:embryology*; D009024:Morphogenesis; D013026:Space Flight; D013997:Time Factors; D014722:Vestibule, Labyrinth / Q000196:embryology* / Q000294:innervation
Issledovanie vestibuliarnogo apparata u émbrionov perepela v éksperimente na biosputnike "Kosmos-1129".