Effect of Denervation of Thermal Cutaneous Receptors on Rectal Temperature Response to Limb Immersion

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Abstract
Rectal temps. of dogs were recorded during leg immersion. Hind legs of normal trained unanesthetized dogs suspended in a hammock in a cool room of 15-18[degree]C were immersed first in cold water, 15-18[degree]C, then in warm water at 45[degree], and finally in cold water. Immersion of the hind legs in warm water invoked cutaneous vasodilatation, indicated by a rise above 30[degree]C of the skin temp. of the ear. The test was repeated on the same dogs after bilateral sectioning of the dorsal roots of the spinal nerves to the hind legs, thus denervating the cutaneous warmth receptors of the hind legs. After bilateral rhizotomy, the thermal cutaneous vasomotor response was considerably retarded illustrating the role of reflex temp. control on an animal with intact central control but impaired reflex control of body temp.

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