- K-slide 21:
- A. Orbicularis oris muscle
- B. Skin (epidermis and dermis) with sebaceous glands and hair follicles
- C. Lining epithelium
- D. Lamina propria
- E. Labial salivary glands in submucosa
- F-F' Vermilion zone
- F. Vermilion border
- A. Orbicularis oris muscle