Nails Protective coverings at the ends of fingers and toes

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Nail Structure and Growth
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Presentation transcript:

Nails Protective coverings at the ends of fingers and toes Plates of tightly packed, hard, keratinized epidermal cells Scale-like modification of epidermis Contains hard keratin Function Protection against trauma to the ends of the digits Help to grasp and manipulate small objects Allow us to scratch

Nails – Indicators of Health White nail bed or oval depressions Anemia Pigmented spot not result of injury Melanoma Horizontal furrows Period of serious illness or malnutrition Extreme Curvature Certain disorders of lungs, heart, or liver Red Streaks Rheumatoid arthritis, ulcers, or hypertension Yellow Chronic respiratory disorders, thyroid disorders, or AIDS Pitted and distorted Psoriasis Blue or purple Lack of blood circulation

Nails - Parts Nail Root Nail Matrix Buried portion of the nail Deep to the nail root Thickened proximal portion of the bed where growth takes place Cells push the nail forward

Nails - Parts Body Bed Visible, attached portion Covers the nail bed Appears pink because of blood flowing through underlying capillaries Bed Under body Deep layers of the epidermis

Nail Parts Cuticle Lunula Eponychium S. corneum of the nail root extends over the exposed nail Lunula White crescent area Appears whitish because the vascular tissue does not show through due to the thickened stratum basale in the area.

Nail Parts Free edge Hyponychium Most distal edge; extends past finger edge Appears white because there are no underlying capillaries Hyponychium Aka. The quick Beneath the free edge Thickened region of the s. corneum, which secures the nail to the fingertip

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