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superior longitudinal muscle
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The superior longitudinal muscles are one of the intrinsic muscles of the tongue. They arise from the fibrous tissue deep to the mucous membrane on the dorsum of the tongue and the midline lingual septum. They pass longitudinally back from the tip of the tongue to its root posteriorly. It inserts into the overlying mucous membrane.

The superior longitudinal muscles act to elevate the tip and sides of the tongue superiorly. This shapes the tongue dorsum into a concavity.