The lip structure:
1- The external surface
2- The internal surface
3- the vermilion margin (red margin)
2- The internal surface
3- the vermilion margin (red margin)
The internal surface of The lip:
The Vermilion (red) margin of the lip:
is continuous with the thin skin of the ext. surface of the lip covered by modified skin characterized by: ![](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_tA7811CG_cn5-KsI_BKWD-yRGXouay85TQW2-2C4WYrdtehBX8qr3ZJwIe13i_O2OtwJfs4_i0NLP265MJm7tkqCsEWLKyH8F7fTH7=s0-d)
- transparent epithelium; formed of stratified squamous non-keratinized epithelium without hair follicles, sebaceous glands or sweat glands.
- deeply and heavily vascular dermal papillae (giving the red color of the lip margin), highly supplied with nerves.
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