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.
Farlex Partner Medical Dictionary © Farlex 2012

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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
The embryonic tongue is formed when the lateral processes meet in the midline and fuse over the tuberculum impar. In some cases, the posterior dorsal point of fusion is abnormal, resulting in the development of an area of smooth, erythematous mucosa lacking papillae.
Two lateral lingual swellings and one median swelling Tuberculum impar from 1st pharyngeal arch forms the anterior 2/3rd of the body of the tongue.
The lateral lingual structures rapidly grow and cover the tuberculum impar to form the anterior 2/3rd of the tongue.
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 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.
These swellings subsequently fuse at the midline and join with the tuberculum impar. The remaining posterior one-third of the tongue arises from a second swelling (the hypobranchial eminence or copula), which is made up of mesoderm of the second, the third, and a portion of the fourth pharyngeal arches.
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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