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Brain temperature and therete mirabile ophthalmicum in the Zebra finch (Poephila guttata) (1981)

Bech, Claus ; Midtgård, Uffe

Springer

Journal of comparative physiology 145 (1981), S. 89-93

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ISSN: 1432-136X

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary 1. Brain and colonic temperatures were measured in five Zebra finches (Poephila guttata) with a mean body weight of 0.013 kg. 2. The mean body-to-brain temperature difference (0.18 °C) was lower than in all other previously studied species of birds, indicating a decreased ability to cool the brain in the Zebra finch. 3. Morphological studies of the head vasculature revealed that therete mirabile ophthalmicum was very simple. The absence of a well-developed rete is presumed to be responsible for the decreased ability of brain cooling. 4. The present study may provide a clue to the well known phenomenon of mass death among small birds during periods with extreme ambient temperatures.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00782598

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