sublingual vein

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Noun1.sublingual vein - a tributary of the lingual vein
vein, vena, venous blood vessel - a blood vessel that carries blood from the capillaries toward the heart; "all veins except the pulmonary vein carry unaerated blood"
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As illustrated in Figures 2(a)-2(c), a retroflex tongue represents a tongue can curl up freely and allow clear observation of the sublingual vein. On the other hand, the nonretroflex tongue corresponds to a patient who cannot curl tongue up to expose sublingual veins for visual inspection.
In a study comparing blood samples from the orbital venous plexus and the sublingual vein, good agreement was found in the WBC count, heterophil and lymphocyte counts, the WBC differential values for heterophils and lymphocytes, PCV, and aspartate aminotransferase, creatine phosphokinase, cholesterol, hemoglobin, serum chloride, and total protein concentrations when comparing the 2 sites.
Sublingual veins should not be dark, varicose or distended.