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"Prenasal" redirects here. For the phonetic meaning, see Prenasalized consonant.
"Postnasal" redirects here. For the phonetic meaning, see Nasal release. For the cause of cough, see Post-nasal drip.
Prenasal and postnasal scales
In reptiles, the nasal scale refers to the scale that encloses the nostril.
Sometimes this scale is paired (divided). In such cases, the anterior half is referred to as the prenasal and the posterior half is referred to as the postnasal.
Supranasal scales are located above the nasal scale.
^ Mallow D, Ludwig D, Nilson G (2003). True Vipers: Natural History and Toxinology of Old World Vipers. Malabar, Florida: Krieger Publishing Company. 359 pp. ISBN0-89464-877-2.
Wright AH, Wright AA (1957). Handbook of Snakes of the United States and Canada. Ithaca and London: Comstock Publishing Associates, a Division of Cornell University Press. (7th printing, 1985). 1,105 pp. ISBN0-8014-0463-0.
