Salivary glands Flashcards
How are secretory cells arranged ?
In Acini ( clusters of cells arranged around a lumen) surrounded by a basement membrane
Cells that are pyramidal in shape (quite large) Round basal nuclei Basophilic perinuclear cytoplasm And secrete protein-rich/watery substanes
Serous secretory acinus cells
Mucous acinus cells
- cells swollen with mucous secretions - flattened basal nucleus - pale staining
Mixed glands
Mix of serous and mucous cells: serious in demilunes in mixed (nuclei get squashed to base of cells - mandibular and sublingual glands are mixed
Circular profile - not a lot of cytoplasm Low cuboidal epithelium
Interpolated ducts
Columnar epi. - lots of cytoplasm Basal striations
Striated ducts
What type of duct is this?
Interlobular duct:
Composed of two subdivisions - intercalated and striated. Goes from simple simple columnar to stratified columnar
Primary duct
Secretes to the oral cavity
What inner action controls secretion?
Autonomic (parasympathetic) - cranial nerve VII (facial) -> mandibular, sublingual, Buffalo and zygomatic glands - cranial nerve XI (glossopharyngeal) -> parotid gland
Where are the scattered salivary glands?
- lips, cheeks, soft palate, and tongue These secretions are mostly mucous (carbohydrate rich) All of these use exocrine cells
What/how do large salivary glands secrete saliva?
They secrete in a duct = single tube Secretions are mostly serous (protein rich/watery)
What gland is this ? Located superficially, ventral to ear (caudal part of head) Larger in herbivore than carnivores
Parotid gland: - larger because they need to masticate more due to diet so need more secretions to help break down
Duct travels: - carnivores: across lateral surface of mass enter muscle - opening in vestibule adjacent to upper fourth premolars - Herbs: medial to ventral border of mandible in horse and ox = crosses ventral border of mandible laterally = enters vestibule same as carn
What gland is located in black?
Mandibular Gland:
Located at angle of jaw Deeper and larger in herbs Duct opens at sublingual carbuncle. (Close to frenulum)
What gland is labelled number 4?
Sublingual:
Monostomatic (single duct) and polystomatic (multiple ducts) parts in most species Ducts run along the floor of oral cavity and open adjacent to frenulum
What gland is ONLY found in dogs and cats?
Zygomatic gland
Present in dog and cat Medial to zygomatic arch (in orbit) Duct opens opposite last upper molar
What gland is this?
Buccal glands:
What is the order of a branching duct system?
