Light Micrograph of a Fetal Nail In Longitudinal Section With Light Micrograph of Part of a Fetal Phalanx In Longitudinal Section
Image ID: 14278
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LM of part of a fetal phalanx in longitudinal section. The nail (arrow) develops similarly to the hair follicle, as a thickened invagination of epidermis. 9×. H&E.
LM of a fetal nail in longitudinal section. The eponychium (Ep) is a superficial layer of epidermis that eventually degenerates, except at the base where it persists as the cuticle. The nail plate (NP) consists of intensely eosinophilic keratin and is derived from germinative cells in the nail matrix (NM). The nail bed, or hyponychium (Hy), underlies the nail plate. It is similar to the epidermis except that its dermal papillae are parallel to the nail surface. This longitudinal orientation allows the plate to move outward. The underlying dermis (De) is highly cellular. 35×. H&E.
LM of a fetal nail in longitudinal section. The eponychium (Ep) is a superficial layer of epidermis that eventually degenerates, except at the base where it persists as the cuticle. The nail plate (NP) consists of intensely eosinophilic keratin and is derived from germinative cells in the nail matrix (NM). The nail bed, or hyponychium (Hy), underlies the nail plate. It is similar to the epidermis except that its dermal papillae are parallel to the nail surface. This longitudinal orientation allows the plate to move outward. The underlying dermis (De) is highly cellular. 35×. H&E.
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