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Isolation of Intact Eyeball to Obtain Integral Ocular Surface Tissue for Histological Examination and Immunohistochemistry

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Merkel cell distribution in the human eyelid.

C A May¹, I Osterland

¹Dresden University of Technology. Albrecht.May@mailbox.tu-dresden.de.

European Journal of Histochemistry : EJH

|January 21, 2014

Summary

This summary is machine-generated.

Merkel cells are rare in adult human eyelids, primarily found in the outer root sheath of eyelash follicles. Their scarcity makes their specific physiological role in eyelid function difficult to determine.

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Area of Science:

Dermatology
Ophthalmology
Histology

Background:

Merkel cell carcinoma (MCC) is a recognized malignancy of the eyelid.
However, the normal distribution and density of Merkel cells within the adult eyelid tissue remain poorly understood.
This knowledge gap hinders a complete understanding of eyelid carcinogenesis and physiology.

Purpose of the Study:

To investigate the distribution and density of Merkel cells in human cadaver eyelid tissue.
To correlate the findings with known localizations of Merkel cell carcinoma.

Main Methods:

Serial sections of 18 human cadaver eyelids (ages 63-97) were prepared.
Immunohistochemical staining for cytokeratin 20 was performed.
Merkel cell distribution was analyzed across different eyelid regions and depths.

Main Results:

Merkel cells were found to be infrequent in the adult eyelid samples.
The primary location of Merkel cells was the outer root sheath of cilia hair follicles.
Cells were more numerous in the mid-portion of the eyelid, with minimal presence at nasal and temporal edges.

Conclusions:

The observed distribution of Merkel cells aligns with common sites of Merkel cell carcinoma development.
The low density of Merkel cells in adulthood suggests a potentially limited or specialized physiological role in the eyelid.
Further research may be needed to elucidate the exact function of these cells in ocular adnexa.