Effect of hypodynamia on structure of vestibular apparatus in Japanese quail chicks: light microscopy
| Autor: | M. Baranovská, Peter Škrobánek, Lenka Buričová |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Vestibular system
inner ear animal structures lcsh:Veterinary medicine General Veterinary biology Weightlessness Sensory system Anatomy Quail Sensory epithelium simulated weightlessness medicine.anatomical_structure biology.animal otorhinolaryngologic diseases medicine lcsh:SF600-1100 Inner ear sense organs Simulated weightlessness sensory epithelium Balance (ability) |
| Zdroj: | Acta Veterinaria Brno, Vol 80, Iss 1, Pp 125-127 (2011) |
| ISSN: | 1801-7576 0001-7213 |
| Popis: | The model for studying the effects of simulated microgravity on the bird organism is hypodynamia. The aim of this study was to investigate the influence of chronic hypodynamia on the structure of the vestibular apparatus in Japanese quail by light microscopy. Morphological changes in the sensory epithelium of chicks reared under hypodynamia from 1 to 42 days of age were evaluated. The differences of shape and arrangement of hair cells in sensory epithelium macula utriculi and the dilatations on their basal parts were found in birds exposed to hypodynamia on day 14 and 42 compared to control. The results confirmed that hypodynamia has specific impact on developmental processes in Japanese quail and indicated that similar damage of inner ear sensory epithelium could be developed in chicks hatched and reared in conditions of real weightlessness during the space flight. Simulated weightlessness, inner ear, sensory epithelium Vestibular apparatus is the sensory system which contributes to balance and spatial orientation of animals. It detects head movements and gravitational stimuli which are transferred upon the mechanosensory hair cells of the inner ear. The hair cells transduce these stimuli into electrical signals which are transmitted to brain (Colclasure and Holt 2003). The development and structural organization of the vestibular receptors under earthly conditions was described (Money et al. 1974; Fermin et al. 1998). However, fewer data are available from the studies of the influences of real microgravity on structure of vestibular apparatus in birds (Lychakov et al. 1993; Kenyon et al. 1995; Fermin et al. 1996), and therefore further information may be provided by the ground-based model of simulated weightlessness (hypodynamia). The first experiment to examine the effects of hypodynamia on the organism of Japanese quail was carried out on adult birds (Jurani et al. 1983). The aim of this experiment was to study the effect of simulated weightlessness on the development of structure of the vestibular apparatus in Japanese quail chicks reared under hypodynamia from 1 to 42 days of age. |
| Databáze: | OpenAIRE |
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