apical ectodermal ridge

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ap·i·cal ec·to·der·mal ridge

the layer of surface ectodermal cells at the apex of the embryonic limb bud; thought to exert an inductive influence on the condensation of underlying mesenchyme and be necessary for continued outgrowth of the limb.


pertaining to an apex.

apical abscess
a localized suppurative inflammation of tissues about the apex of a tooth root.
apical delta
a foramen made up of multiple fine channels found at the apex of a tooth root through which the blood supply and nerves pass.
apical ectodermal ridge
an ectodermal thickening at the end of each limb bud in the developing embryo; of critical importance in the initiation of limb segments.
apical halo
a radiological feature of apical abscesses in which the surrounding alveolar bone becomes radiolucent.
apical lung lobe
the cranial lobe of the lung.
penile apical ligament
a fibrous band along the dorsal surface of the distal part of the penis of the bull which helps to produce a slight twist in the erect state. Abnormality may contribute to the development of deviation of the penis during erection.