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17 Cards in this Set

  • Front
  • Back
Embryonic Origin of Epithelium
about anterior 2/3 is derived from ectoderm - anterior lining of oral cavite
about posterior 1/3 is derived from endoderm - back of oral cavity all the way to anus
Three types of papillae found on tongue
1) Filiform - gives tongue roughness, is the most abundant type, no taste buds on them, is keratinzed, are sharp and pointed.

2.) Fungiform - Do have tastebuds on them, unlike filiform, are round, not pointy.

Both of these have some connective tissue inside of it known as secondary papillae.

3.) Circumvallate - about 10-12 of them in the back of tongue, loaded w/ taste buds (but will not see in lab)
Three parts of the tastebud and where it's found
Found on the side of the fungiform. They have taste pores, microvilli (increase surface area to maximize/protect taste), and elongated nuclei.
5 Human Tastes Found on Tongue
1) Salt
2) Sweet
3) Acid/Sour
4) Bitter
5) Umami (MSG)

There is no tongue map that explains what region has what taste
Salivary Glands - What's in saliva?
contains H20, ions, mucus, hormones, antibodies, enzymes
Three types of paired salivary glands
1) Parotids
2) Submaxillary/Submandibular
3) Sublingual

There are also salivary glands on the lip (inside of lip-the bumps), tongue, and uvula
2 types of secretions from 2 types of cells in the salivary glands
1) The serous cell in the serous acinus have rounded nuclei w/ a dark cytoplasm. Their function is to secrete a watery, rich in ions & enzymes solution.

2) The Mucous Cell - secretes mucus, particularly mucin, which is a protein polysaccharide that helps protect body surfaces. It's nuclei are not round and it has a light cytoplasm.
The 2 types of enzymes found in the water secretion
1) Salivary Amylase - has a digestive and maybe also a defensive function

2) Lysozyme - antibacterial
What is the salivary gland made up of?
Myoepithelial cells line the outside. There is are secretory granules which stain dark, a duct, acinus (which is where the cells and secretory granules are)
Serous Demilune
AKA mixed acinus, which has both serous and mucous cells. surrounding the salivary gland is connective tissue. the dark part of the demilune has serous cells.
Striated Duct (hypotonic)
modify the saliva by removing its ions and putting them back into connective tissue, causing saliva to be hypotonic, which is a defensive mechanism b/c it its not hypotonic, then water could rush in and cause the cell to explode. the striations are in the basement of the duct.
Parts of the Tooth (4)
Enamel - hardest material in the body, very little organic material, most of it is mineral, is on the surface of the tooth

Dentin - next hardest material, retains cell processes, is found under the enamel.

Cementum - 3rd hardest

Pulp Cavity - found in between the dentin pieces.
Parts of Tooth During Formation (7)
1) Stellate Reticulum - fluid filling the inside, determines the shape of tooth by pulling it in different directions

2)Mesenchyme - is the white substance outside the tooth

3) Outer Enamel Epithelium - lines the outer most edge

4) Statum Intermedium - first layer touching the stellate reticulum

5) Ameloblasts - next layer underneath the statum intermedium, secretes enamel, are simple columnar cells

6) Odontoblasts - under
ameloblasts, secrete dentin

7) Early Pulp Cavity

The secretions from the odontoblasts and ameloblasts, plus the stellate reticulum shaping everything, all together cause the development of the tooth.
More Tooth Formation - specific layers (from the top)
Ameloblasts, Odontoblasts, Enamel (red on slides), Dentin (Pink on slides), Predentin, Odontoblasts
Parotid Gland
Strictly serous cells in the adult. Located in the back of the mouth. Largest salivary gland
Submaxillary (Submandibular) Gland
Mixed Serous/Mucuous - serous demilunes. Located beneath the floor of the mouth
Sublingual Gland
Mixed Serous/Mucuous - serous demilunes. They lie anterior to the submandibular gland under the tongue