What is the clinical anatomy of the nail bed relevant to subungual hematoma drainage?

Updated: Aug 25, 2020
  • Author: Oliver Mayorga, MD, MS, FACEP; Chief Editor: Erik D Schraga, MD  more...
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The perionychium is the tissue on each side of the nail, and the eponychium is the skin immediately proximal to the nail. Beneath the eponychium lies the germinal matrix; its distal portion, or lunula, is visible under the proximal nail. The germinal matrix generates most of the nail, while the more distal sterile matrix adheres the nail to the nail bed and assists with nail migration. Injury to the germinal matrix may lead to permanent nail loss. [5, 6] Nail bed anatomy is depicted in the images below.

Nail bed anatomy figure 1. Nail bed anatomy figure 1.
Nail bed anatomy figure 2. Nail bed anatomy figure 2.

For more information about the relevant anatomy, see Nail Anatomy.

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