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Thermal nasal window. (A) To mark the perinasal window, a large circle is drawn around the entire snout with the upper lip as its ventral limit. (B) The nasal region and vasomotor changes there depend on circulation through the lateral and caudal nasal arteries and the dorsalis nasi vein, a branch of the facialis vein. These structures respond with vasodilation or vasoconstriction, according to the stimulus perceived.
