Gastrointestinal tract 1

Question 1

92. Lip (Krutsay’s trichrome stain)

Answer 1

• orbicularis oris muscle
• Cutaneous part:
  
  • hairy skin + hair follicles + sebaceous + merocrine sweat glands
• Transitional part:
  
  • thin, lightly stained keratinized stratified squamous epithelium
  • dermis: high CT papillae, highly vascular
  • blood vessels on surface
  • devoid of sweat glands and salivary glands
• Mucosal part:
  
  • thick non-keratinized stratified squamous epithelium
  • lamina propria: CT papillae
  • submucosa: strong collagenous CT
  • small labial glands between lamina propr. + orbicular oris

Question 2

Salivary glands

Answer 2

• lobular structures, subdivided into smaller lobules
• mucous/serous cells
• intercalated duct ⇒ striated duct ⇒ interlobular duct
• plasma cells ⇒ secrete IgA

Question 3

Mucous secretory cells

Answer 3

• cuboidal or columnar
• dark, flattened nuclei
• Giannuzzi demilune: serous cell cap on mucous cell
• light pink
• wide lumens

Question 4

Serous secretory cells

Answer 4

• strongly basophilic
• round nuclei
• narrow lumina

Question 5

52. Submandibular gland (HE)

Answer 5

• mixed mucous-serous gland
• compound tubulo-acinar gland, branched tubular and branched acinar secretory units
• serous secretory units predominate
• large number of adipocytes
• intercalated ⇒ striatal ⇒ interlobular ducts

Question 6

9. Sublingual gland (HE)

Answer 6

• compound, branched tubulo-acinar gland
• mixed mucous-serous gland
• mucous secretory units predominates
• Giannuzzi demilune
• short intercalated duct ⇒ striated duct ⇒ interlobular duct

Question 7

51. Parotid gland (HE)

Answer 7

• only serous acini
• clusters of adipocytes
• acinar lumen is narrow
• intercalated ⇒ striated ⇒ interlobular ducts
• fibers of facial nerve
• duct opens into oral vestibule