The perionyx is the projecting edge of the eponychium covering the proximal strip of the lunula .
The eponychium is the end of the proximal fold that folds back upon itself to shed an epidermal layer of skin onto the newly formed nail plate .
The perionyx is the projecting edge of the end covering the proximal strip of the lunula .
The eponychium is the end of the proximal fold that folds back upon itself to shed an epidermal layer of skin onto the newly formed nail plate .