Induction of Persistent Estrus by Constant Light: Effects of Neonatal Constant Light and Harderian Gland Function

1978 ◽  
Vol 27 (5-6) ◽  
pp. 193-203 ◽  
Author(s):  
K. Shirama
Keyword(s):  
Harderian Gland ◽  
Constant Light ◽  
Persistent Estrus ◽  
Light Effects ◽  
Gland Function

Can an orbital gland function in the vomeronasal sense? A study of the pygopodid Harderian gland

2000 ◽  
Vol 78 (4) ◽  
pp. 648-654 ◽  
Author(s):  
S J Rehorek ◽  
B T Firth ◽  
M N Hutchinson
Keyword(s):  
Vomeronasal Organ ◽  
Harderian Gland ◽  
Nasolacrimal Duct ◽  
Morphological Features ◽  
Direct Link ◽  
Growing Body ◽  
Gland Function

The Harderian gland occurs in the orbit of most tetrapod vertebrates. A growing body of evidence suggests that this gland is associated with the chemoreceptive function of the vomeronasal organ. In the present study, the morphology of the Harderian gland in two species of pygopodids was examined, and the results were contrasted with those from both geckos and snakes. The results show that the pygopodid Harderian gland shares histochemical and ultrastructural features with that of the geckos. However, in several gross morphological features, the pygopodid Harderian gland more closely resemble that of snakes than that of geckos. In both pygopodids and snakes, the nasolacrimal duct forms a direct link between the Harderian gland and the vomeronasal organ, which indicates that this specialized connection between the Harderian gland and vomeronasal organ is a convergent evolutionary attribute of these two groups.

Hypoprolactinemic rats under conditions of constant darkness or constant light. Effects on the sleep–wake cycle, cerebral temperature and sulfatoxymelatonin levels

1999 ◽  
Vol 835 (2) ◽  
pp. 282-289 ◽  
Author(s):  
Letı́cia Leite Lobo ◽  
Bruno Claustrat ◽  
Gabriel Debilly ◽  
Luce Paut-Pagano ◽  
Michel Jouvet ◽  
...  
Keyword(s):  
Constant Light ◽  
Constant Darkness ◽  
Light Effects

Ultrastructure of the Surface Epithelium of the Polycystic Ovary in Constant Light Rats

1982 ◽  
Vol 40 ◽  
pp. 240-241
Author(s):  
K. B. Singh ◽  
F. K. Khosho
Keyword(s):  
Electron Microscopy ◽  
Polycystic Ovary ◽  
Continuous Light ◽  
Female Rats ◽  
Constant Light ◽  
Surface Epithelium ◽  
Transmission Electron ◽  
Persistent Estrus ◽  
Microscopic Studies ◽  
Pco Syndrome

It is now well established that exposure of cyclic female rats to continuous light induces persistent estrus (PE), a syndrome which in many respects resembles the human polycystic ovary (PCO) syndrome. As in the human PCO, light microscopic studies of cystic ovaries of the constant light rat show numerous atretic follicles, and the surface epithelium grossly appears smooth and white. In the present study, we have utilized scanning (SEM) and transmission electron microscopy (TEM) to study changes on the surface epithelium of PCO in the constant light rat model.

OBSERVATIONS ON THE PINEAL GLAND, THE HARDERIAN GLANDS, THE RETINA, AND THE REPRODUCTIVE ORGANS OF ADULT FEMALE RATS EXPOSED TO CONTINUOUS LIGHT

1971 ◽  
Vol 51 (1) ◽  
pp. 117-125 ◽  
Author(s):  
R. J. REITER ◽  
D. C. KLEIN
Keyword(s):  
Adult Female ◽  
Light Exposure ◽  
Continuous Light ◽  
Harderian Gland ◽  
Female Rats ◽  
Constant Light ◽  
Continuous Illumination ◽  
Albino Rats ◽  
Surgical Removal ◽  
Harderian Glands

SUMMARY Harderian gland removal caused enlargement of the uteri of adult female albino rats which were maintained in 14 h light and 10 h darkness/day. Constant light exposure led to regression of the ovaries, adrenal glands and Harderian glands while the uteri exhibited a significant hypertrophic response. None of these changes were affected by surgical removal of the Harderian glands. The eyes and the retinas of albino rats maintained under continuous illumination underwent atrophic changes with the receptor cell elements of the retinas completely disappearing within 9½ weeks. Constant light obliterated the diurnal rhythm in the pineal enzyme, N-acetyltransferase. Neither the activity of pineal hydroxyindole-O-methyl-transferase nor the activity of pineal N-acetyltransferase were influenced by removal of the Harderian glands.

Sign in / Sign up

Export Citation Format

Share Document