Lip Flashcards
1
Q
what skeletal muscle is seen in the vicinity of the lip?
A
orbicularis oris
2
Q
what are the three natural surfaces in the slide of the lip?
A
- cutaneous
- transitional
- mucosal
3
Q
features of the cutaneous part
A
external surface covered by hairy skin, distinguished by hair follicles, sebaceous glands and merocrine sweat glands
4
Q
features of the transitional zone
A
- lined by lightly keratinized stratified squamous epithelium
- dermis below forms high conn. tissue papilla (vascular)
- devoid of salivary glands and sweat glands
5
Q
features of the mucosal part
A
- non kerat. sq. epith.
- lamina propria lies underneath forming tissue papilla
- strong collagenous conn tissue of submucosa attaches to lamina propria
- labial glands lie in between lamina propria and orbicularis oris.
6
Q
what does the trichrome stain demonstrate
A
- collagen fibers in blue
- elastic fibers and muscles in red
- cell nuclei are bright red
