Abstract
The lamprey epidermis is composed of three cell types, I.e., mucous cells, club cells, and granular cells. By far the most common of the three, the mucous cells are found throughout the epidermis and along the epidermal surface. Like most other vertebrate epidermal cells, the lamprey epidermal mucous cells have numerous membrane specializations, including desmosomes, tight junctions, zonulae occludens. The mucous cells lining the lamprey epidermal surface actively release membrane-bound mucous droplets onto the epidermal surface. Freeze-cleave and freeze-etch techniques have been applied to the lamprey epidermis in order to study the cell membrane structure during release of mucus droplets and maturation of the epidermal mucous cells.
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