A pontine–hypothalamic temperature difference correlated with cutaneous and respiratory heat loss

The right ear but not the left ear temperature is related to stress-induced cortisolaemia in the domestic cat (Felis catus)

“…The increased blood flow associated to higher vasodilation in more activated areas of the brain initiates heat loss. In some felids, including domestic cats, the presence of the carotid rete, a group of tributaries of the internal carotid which cools down the blood through the humidification of nasal mucosa during respiration, also contributes significantly for the cerebral temperature stability (Caputa, 2004;Parmeggianni et al, 1998).…”

“…The presence of selective brain cooling in cats (Parmeggianni, Azzaroni, & Calasso, 1998), and additional reflex and metabolic vasodilation mechanisms, is expected to yield a greater difference in the temperature gradient between each ear. Brain temperature oscillation of each hemisphere can be reliably evaluated through its relationship with the tympanic and the ear channel temperature (Cherbuin & Brinkman, 2007).…”

Hibernation Patterns of Dwarf Lemurs in the High Altitude Forest of Eastern Madagascar

“…However, thermoregulation should not be expected to influence ear length in primates, as primates lack a carotid rete and therefore do not exploit counter-current heat exchange mechanisms for brain cooling. In rabbits, carnivores, elephants, and bovids (animals that do in fact exploit counter-current heat exchange mechanisms; Parmeggiani et al 1998), pinna size varies with both external temperature and activity levels. But even here, species that occupy a wide altitude range can violate the expectations of Allen's rule (e.g., Liao et al 2007, on the lagomorph Ochotona daurica in northern China, which ranges over altitudes of 400-4,000 m above sea level).…”

Systemic Homeostasis and Poikilostasis in Sleep

“…The vascular conductance increases in the skin beds of heat exchangers in cats (Mancia and Zanchetti, 1980;Parmeggiani et al, 1977), rabbits (Franzini et al, 1982;Parmeggiani et al, 1998), rats (Parmeggiani et al, 1998) and human subjects (Noll et al, 1994;Sindrup et al, 1992), creating heat loss increases that decrease body temperature in NREM sleep.…”