tuberculum impar

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Related to tuberculum impar: hypobranchial eminence

median lingual swelling

in the embryo, a small elevation in the floor of the mouth between the first and second pharyngeal arches; it is overgrown by the lateral lingual swellings and forms a small unrecognizable part of the posterior region of the anterior two thirds of the tongue.

me·di·an lin·gual swell·ing

(mē'dē-ănling'gwăl swel'ing)
A smooth swelling in the midline of the floor of the primordial mouth between the first and second pharyngeal arches; it is incorporated into the tongue but forms no recognizable part of it.
Synonym(s): median tongue bud, tuberculum impar.

me·di·an lin·gual swell·ing

(mē'dē-ăn ling'gwăl swel'ing)
In embryo, small elevation in floor of mouth between first and second pharyngeal arches; overgrown by lateral lingual swellings; forms a small part of posterior region of anterior two thirds of tongue.
References in periodicals archive ?
The lateral lingual structures rapidly grow and cover the tuberculum impar to form the anterior 2/3rd of the tongue.
The embryonic tongue is formed when the lateral processes meet in the midline and fuse over the tuberculum impar.
The thyroid gland appears as an epithelial proliferation in the floor of the pharynx between tuberculum impar and the copula at a point later indicated by foramen caecum.
Lingual foregut duplication cysts are believed to arise from endodermal cells that become trapped during the fusion of the lateral lingual swelling (distal tongue bud) and the tuberculum impar (median tongue bud) in the 3- to 4-mm embryo.
The thyroid gland develops at the junction between tuberculum impar (forms anterior two third of tongue) and hypobranchial eminence (forms the posterior one third of tongue) which forms the foramen caecum (2).

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