Abstract
Hypothalamic neuronal thermosensitivity was investigated in brain slices of Muscovy duck embryos (28th and 33rd days of incubation) and 1-, 5-, and 10-day-old ducklings using extracellular recordings. Until day 5 post-hatching the hypothalamic neuronal thermosensitivity is characterized by a high cold sensitivity (up to 30%). Between days 5 and 10 post-hatching hypothalamic neuronal cold sensitivity decreases significantly from 30 to 14% while warm sensitivity increases from 5 to 14%. Temperature guardian neurons which were sensitive exclusively in a small temperature range around 36°C and 42°C (ducklings) or 38°C and 40.5°C (embryos) were found. Possibly, they might play a role in the wide band control of body temperature.
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