Gastrointestinal tract 1 Flashcards
LIP (Krutsay’s trichrome staining)
What are the three natural surfaces?
- Cutaneous part (external surface)
- Vermilion border (transitional part)
- Mucosal part (facing the oral cavity)
LIP (Krutsay’s trichrome staining)
What structures can we identidy in the Cutaneous part?
- hair follicles
- sebaceous and merocrine sweat glands
LIP (Krutsay’s trichrome staining)
What structures can we identify in the Transitional zone (vermilion border)?
- covered by thin, lightly keratinized stratified squamous epithelium
- reddish colour due to close proximity of blood vessels to the surface
- NO salivary and sweat glands
LIP (Krutsay’s trichrome staining)
What structures can we identify in the mucosal part?
- epsecially thick non-keratinized stratified squamous epthelium
- Lamina propria forms numerous connective tissue papillae, deeply penetrating into the epithelium
- small labial glands
LIP (Krutsay’s trichrome staining)
What does the staining demonstrate?
- Collagen fibers in BLUE
- elastic fibers and muscle fibers in RED
- Cell nuclei BRIGHT RED
SUBMANDIBULAR GLAND
What structures can be found?
It is a tubulo-acinar gland, that consists of branched tubular and branched acinar secretory units emptying into a branched duct system!
- (Acinar) serous secretory units PREDOMINATE
- -> (tubular) mucous secretory units are scattered amongs them
in interlobular connective tissue:
- Large number of adiposcytes
In the duct system:
- striated or interlobular ducts can be observed
SUBLINGUAL GLAND (+SUBMANDIBULAR GLAND)
Differences between the two parts
Sublingual gland is lighter stained.
Submandibular gland is darker stained
PAROTID GLAND
How to identify
Almost entirely composed of basophilic stained serous secretory units
- clusters of adipocytes are scattered among the secretory end-pieces
- acinar lumen is narrow, so therefore rarely seen
Look for: Intercalated, striated and large interlobular ducts”
Note: fibers of facial nerve passing through the gland
