[Illustration: FIG. 63.--Cicatricial Contraction following Severe Burn.]
In _burns of the fifth degree_ the lesion extends through the
subcutaneous tissue and involves the muscles; while in those of the
_sixth degree_ it passes still more deeply and implicates the bones.
These burns are comparatively limited in area, as they are usually
produced by prolonged contact with hot metal or caustics. Burns of the
fifth and sixth degrees are met with in epileptics or intoxicated
persons who fall into the fire. Large blood vessels, nerve-trunks,
joints, or serous cavities may be implicated.
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