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Sometimes it takes more than one visit to tackle the problem, especially when the skin can’t be treated due to nail over- and ingrowth.

Her father, a college football coach, schooled her in the importance of trimming toenails square to prevent ingrowth, so that’s reason No. 1.

The rudiment of the central nervous system has the form of a solid keel-like ingrowth of ectoderm along the mid-dorsal line, which only secondarily becomes hollowed out—just as happens in Teleostean fishes.

In the second group the kidney changes are apparently due to the general arteriosclerosis which, affecting the kidney vessels, causes changes leading to atrophy and subsequent fibrous tissue ingrowth of scattered areas.

One end of the blastopore becomes nearly closed, and an ingrowth of ectoderm takes place around it to form the stomodaeum or fore-gut and mouth.