Lip

Question 1

what skeletal muscle is seen in the vicinity of the lip?

Answer 1

orbicularis oris

Question 2

what are the three natural surfaces in the slide of the lip?

Answer 2

• cutaneous
• transitional
• mucosal

Question 3

features of the cutaneous part

Answer 3

external surface covered by hairy skin, distinguished by hair follicles, sebaceous glands and merocrine sweat glands

Question 4

features of the transitional zone

Answer 4

• lined by lightly keratinized stratified squamous epithelium
• dermis below forms high conn. tissue papilla (vascular)
• devoid of salivary glands and sweat glands

Question 5

features of the mucosal part

Answer 5

• 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.

Question 6

what does the trichrome stain demonstrate

Answer 6

• collagen fibers in blue
• elastic fibers and muscles in red
• cell nuclei are bright red