A morphometric study of seasonal influences on the daily cycle of rat submandibular glands
Braz. j. morphol. sci
; 17(2): 93-100, jul.-dez. 2000. ilus
Article
en En
| LILACS
| ID: lil-313964
Biblioteca responsable:
BR734.1
RESUMO
The submandibular glands of rats raised at room temperature show daily and seasonal variations. To quantify these variations, the submandivular glands of male Wistar rats were collected at 4h intervals over a 24h period in the summer and winter and processed for histological analysis. Gland weight decreased 37 per cent (P<0.01) in the winter and 13 per cent in the summer. The volume of the acinar compartment decreased 73 per cent (P<0.01) between midnight and 4 a.m. in the winter and 38 per cent (P<0.01) between 8 p.m. and midnight in the summer. In contrast, the volume of the stroma increased about 164 per cent (P<0.01) between midnight and 4 a.m. in the winter and by 10 per cent (P<0.01) between 8 p.m. and midnight in the summer. the volume of the duct system generally remained constant, although in the winter the convoluted granular tubules diminished 44 per cent (P<0.01) between midnight and 4 a.m. Although the volume of the intercalated ducts remained constant over 24h in both seasons, there was a 49 per cent decrease in winter compared to summer (P<0.01). These results indicate that the large changes in gland weight were caused mainly by variation in the volume of the acini, convoluted granular bubules ans stroma. The morphological variations were much more pronounced in winter than in summer and this affected the daily saliva production.
Texto completo:
1
Colección:
01-internacional
Base de datos:
LILACS
Asunto principal:
Glándula Submandibular
/
Ritmo Circadiano
Límite:
Animals
Idioma:
En
Revista:
Braz. j. morphol. sci
Asunto de la revista:
ANATOMIA
Año:
2000
Tipo del documento:
Article
País de afiliación:
Brasil
Pais de publicación:
Brasil