The groove gradually becomes converted into a series of sockets by the ingrowth of transverse bars of bone.
This is indicated by the fact that they appear in some cases to be lined by an ingrowth of ectoderm.
The ingrowth of synovial membrane may fill up the cavity of the joint, or may divide it up into compartments.
The fins, both median and paired, obtain their musculature by the ingrowth into them of muscle buds from the adjoining myotomes.
Because the mouth and throat are lined by an ingrowth from the external skin; the origin and growth of this is seen in the embryo.
In the course of embryonic development all glands are formed by an ingrowth of the surface.
In Osseous Fish there appears to be no doubt that the floor is largely formed by an ingrowth of this kind.
In these instances there is no commencement of an ingrowth in the manner supposed for meroblastic ova.
But even in stage B there are beginnings of a cellular ventral wall derived from an ingrowth of cells from the two sides.
ingrowth in·growth (ĭn'grōth')
Something that grows inward or into a part of the body.