median groove of tongue

median sulcus of tongue

[TA]
a slight longitudinal depression on the dorsal surface of the tongue extending from the foramen cecum and dividing the dorsum into right and left halves.

median sulcus of tongue

A shallow median depression on the dorsal surface, which extends from the tip of the tongue to the foramen caecum.

me·di·an groove of tongue

(mē-dē'ăngrūv tŭng)
Median groove or median longitudinal raphe of tongue; raphe linguae; a slight longitudinal depression running forward on the dorsal surface of the tongue from the foramen cecum.
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