Medical Definition of mandibular angle. : an angle formed by the junction at the gonion of the posterior border of the ramus and the inferior border of the body of the mandible.
When a fully grown nail is atrophied, it loses its shine; loses healthy look, starts to shrink in size, and may eventually falls away. This condition is called Onychatrophia and also known as atrophy. There are number of degrees of onychatrophia condition. An individual can have only one nail that has atrophied. However, this condition can never worsen because the condition was identified and treated as soon as possible.
Koilonychia is dystrophy of the fingernails in which they are thinned and concave with raised edges. Koilonychia is a dystrophy of the fingernails, sometimes associated with iron deficiency anaemia, in which they are thin and concave, with the edges raises. Acquired koilonychia may be associated with iron deficiency anaemia. The nails take a long time to return to normal.