Related Experiment Videos
The innervation of human epidermis
W R Kennedy1, G Wendelschafer-Crabb
1Department of Neurology, University of Minnesota, Minneapolis.
Journal of the Neurological Sciences
|April 1, 1993
Summary
Researchers discovered nerve fibers throughout all human epidermis layers, originating in the dermis. These findings challenge current theories on skin sensation and peripheral nerve structure.
Area of Science:
- Dermatology
- Neuroscience
- Histology
Background:
- The precise distribution and nature of nerve fibers within the human epidermis have been a subject of ongoing investigation.
- Previous studies suggested limited innervation of the epidermis, primarily focusing on specific sensory receptors.
Purpose of the Study:
- To investigate the presence and distribution of nerve fibers within all layers of the human epidermis.
- To characterize the morphology and potential sensory function of epidermal nerve fibers.
Main Methods:
- Immunohistochemical staining techniques were employed to visualize nerve fibers.
- Electron microscopy was utilized to confirm the presence and ultrastructure of epidermal nerve endings.
Main Results:
- Numerous nerve fibers were identified in all epidermal cell layers, extending from dermal nerve trunks.
- Nerve fibers exhibited a three-dimensional distribution, terminating in small enlargements near the skin surface and deeper within the epidermis.
- Some nerve endings were observed external to the stratum granulosum cells.
Conclusions:
- The human epidermis is extensively innervated by nerve fibers, contrary to previous assumptions.
- These findings suggest a more complex role for epidermal nerves in peripheral sensation.
- The presence of widespread epidermal innervation necessitates a revision of current models of skin sensory structure and function.