from The Century Dictionary.
- noun The act of growing downward; the product of a downward growth.
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It is produced by a downgrowth of the epithelium of the dental germ, which extends almost as far as the situation of the apex of the future root, and determines the form of this portion of the tooth.
If the cut ends of the nerve be sutured together regeneration of the nerve fibers takes place by the downgrowth of axons from the central end of the nerve.
The central cells of the ectodermal downgrowth degenerate and a secondary labial groove is formed; by the deepening of this, the lips and cheeks are separated from the alveolar processes of the maxillæ and mandible.
Along the free margins of the processes bounding the mouth cavity a shallow groove appears; this is termed the primary labial groove, and from the bottom of it a downgrowth of ectoderm takes place into the underlying mesoderm.
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