Salivary Glands & Ducts

Which gland has the product secreted via a duct?

Exocrine salivary glands

True or False: merocrine glands do not lose cytoplasm during the release of product.

TRUE

What are the five major salivary glands grossly visible?

• Parotid

• Mandibular

• Zygomatic

• Sublingual

• Molar

What are the minor salivary glands within the oral cavity?

• Labial

• Lingual

• Von Ebners

• Buccal

• Palantine

Which species has a difference in their mandibular salivary glands within secretion by the nature of the product? What is the difference?

Rodent - serous rather than mixed

Which species has differnces in their sublingual salivary gland secretiosn by nature of the product? What is it?

Rodent - mucous rather than mixed

What salivary gland is always serous regardless of species?

Parotid

What is the secretory product produced by mucous glands?

Mucinogen

What is the name of the arrnagment of mixed salivary glands?

Serous demilune

What is the function of myoepithelial cells?

surround the base of secretory cells to facilitate movement out of the cell via its contractile properties

Which ducts are wiuthin the lobule?

Intercalated and Intralobular (striated)

How do you differentiate Intercalated ducts versus intralobular (striated) ducts?

Intercalated: 4-8 cells in crosssection, VERY small in diameter, simple cuboidal

Intralobular: infoldings causing striation, greater than 8 cells in crosssection, simple columnar

What do the situations in intralobular ducts contain? Why?

They contain situations with mitochondria which creates energy for bicarbonate and potassium into the saliva and to extract sodium and chloride from saliva

What are the defining features of Interlobular ducts?

located in septa between lobules and completely surrounded by connective tissue

Boundaries of the Vestibule

Rostral: lips

Lateral: cheeks

Internal: teeth and gums

Bondaries of oral cavity proper

Rostral/Lateral: teeth and gums

Ventral: tongue and mucosa

Dorsal: hard and soft palate

Is there a Muscularis mucosa in the mouth?

No. Therefore there is a Lamina Propina - Submucosa

Mucocutaneous Junction

site of transition between epidermis and mucous membrane (lips)

Papillae

modifications of mucosa that are projections of tissue from the tongue surface

Which papillae do not contain taste buds?

Conical and Fungiform and both accesory papillae (lenticular & marginal)

Filiform Papillae: Taste Buds Present?, Location, Appearance, Special Species Differences

Taste Buds: NO

Location: dorsal surface of Rostral 2/3

Appearance: sharply pointed apex with broad base

Species Differences: Cat & Cow (keratinized for sandpaper tongue), Horse (no CT core only epithelium)

Fungiform Papillae: Taste Buds?, Location, Appearance

Taste Buds: Yes! - dorsal surface

Location: dorsal surface of Rostral 2/3

Appearance: mushroom with thin stalk

Conical Papillae: Taste Buds?, Location, Appearance, Species Differences

Taste Buds: No

Location: dorsal surface of caudal 1/3

Appearance: pointed apex with wide circular base

Species Differences: Horses (absent)

Vallate Papillae: Taste Buds?, Location, Appearance

Taste Buds: Yes! - lateral wall

Location: dorsal surface between rostral and causal junction

Appearance: large and round mushroom appearance that are submerged into the tongue surface (deep sulcus) with submucosal serous glands at the base (Von-Ebners)

Foliate Papillae: Taste Buds?, Location, Appearance, Species Differences

Taste Buds: Yes! - side of papillae but may degenerate in infancy

Location: dorsolateral surface of caudal 1/3

Appearance: trident like or leaf like projections seperated by sulci with Von Ebners glands

Species Differences: Cow (ABSENT), Cat (no taste buds)

Marginal Papillae

present in neonatal carnivores and pigs along the lateral margins of tongue apex that regress ~ 2 weeks

Lenticular Papillae

present in ruminants and humans that are lens shaped on the surface of torus linguae

What is the average ghost span of taste buds?

10 days

What nerves innervation the taste buds?

CN VII, IX, X