Lip (20X)

Image copyright: Mathias Nordvi, ARR. (Tissue stain: H+E).

This is a section through a lip. You can follow the epithelium covering the surface of the lip. The outer surface is covered by the skin (dermis and epidermis). On its surface, you'll find a thin, keratinized layer of epithelial cells (no nuclei to be seen).

Below the epithelium, you'll find connective tissue, glandular tissue and the orbicularis oris muscle.

The inner surface is covered by the oral mucosa.