Gastrointestinal System I

Lip, Monkey

On the external aspect, note the thin skin with hair follicles and sebaceous glands. Follow the epithelial covering on its surface and note the transitional change of the epithelium from the keratinised stratified squamous lining(represents the outer aspect of the lip) to the non-keratinised stratified squamous lining(represents the oral or buccal aspect of the lip). Note the presence of mucuous labial glands on the oral side. The core is made up of striated skeletal muscle fibres cut in several planes.