Tuberculum impar

Tuberculum impar

Infobox Embryology
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GrayPage = 1102


Caption = Floor of pharynx of human embryo about twenty-six days old.


Caption2 = Floor of pharynx of human embryo of about the end of the fourth week.
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GivesRiseTo = tongue
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DorlandsPre = t_21
DorlandsSuf = 12828887
During the third week of embryological development there appears, immediately behind the ventral ends of the two halves of the mandibular arch, a rounded swelling named the tuberculum impar, which was described by His as undergoing enlargement to form the buccal part of the tongue.

More recent researches, however, show that this part of the tongue is mainly, if not entirely, developed from a pair of lateral swellings which rise from the inner surface of the mandibular arch and meet in the middle line. The site of their meeting remains post-embryonically as the median sulcus fo the tongue.

The tuberculum impar is said to form the central part of the tongue immediately in front of the foramen cecum, but Hammar insists that it is purely a transitory structure and forms no part of the adult tongue.

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Look at other dictionaries:

  • tuberculum impar — tuberculum im·par im .pär n an embryonic swelling that is situated in the midline of the floor of the pharynx between the ventral ends of the two sides of the mandibular arch and of the second branchial arch and that prob. contributes to the… …   Medical dictionary

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  • tuberculum — SYN: tubercle. [L. dim. of tuber, a knob, swelling, tumor] t. adductorium femoris [TA] SYN: adductor tubercle of femur. t. anterius atlantis [TA] SYN: anterior tubercle of atlas. t. anterius thalami [TA] SYN: anterior thalamic tubercle …   Medical dictionary

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  • facial lobe — tuberculum impar (the lateral middle walls of the fourth ventricle of the brain, each expanded as two lobes and meeting in the midline to separate the ventricle into posterior and anterior halves). Associated with cranial nerve VII …   Dictionary of ichthyology

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  • Kiemenfurche — Schematischer und unvollständiger Horizontalschnitt durch die Kiemenbogen I IV Kiemenbogen, 1 4 Schlundtaschen (innen) bzw. Kiemenfurchen (außen), a Tuberculum laterale, b Tuberculum impar, c Foramen cecum, d Ductus thyreoglossus, e Sinus… …   Deutsch Wikipedia

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