Fingertip Skin Anatomy: Five Histologic Layers

The fingertip skin is specialized for tactile discrimination. Histologically, it comprises five layers (from superficial to deep):

1. Stratum corneum (keratin layer) – thick, keratinized dead cells; barrier.
2. Stratum lucidum – clear, eosinophilic layer (only in thick skin: palms/soles).
3. Stratum granulosum – keratohyalin granules, lipid secretion.
4. Stratum spinosum – “prickle cells,” desmosomes, Langerhans cells.
5. Stratum basale – single layer of proliferative keratinocytes; melanocytes.

Note: The original list (epidermis, dermis, hypodermis, nail matrix, nail plate) mixes tissue layers with adnexal structures. The epidermis itself contains the five layers above. Beneath lie:

• Dermis (connective tissue, vessels, nerves, appendages)
• Hypodermis (subcutaneous fat)
• Nail unit: matrix (proximal), bed, plate, folds.

Specializations

• Meissner’s corpuscles (light touch), Merkel cells (sustained pressure), Ruffini endings (stretch), Pacinian corpuscles (vibration) – concentrated in fingertips.
• Dense capillary loops → rapid blanching/refill.