Embryology Chapter nine

The tissue that lines the oral cavity

Three layers of the oral mucosa

New name for connective tissue; it has the same layers, but now they have new names, and a few more details

Loose connective tissue with "papilla" - finger like projections into the overlying epithelium which increase the surface area

capillary system that runs between the two layers and sends more capillaries up into each papilla

dense connective tissue layer of the lamina propria

may or may not be present deep to the dense layer. It can be adipose tissue (most common), saliva glands, or muscle

the layer that the connective tissue of the oral mucosa connects directly to if the submucosa is not present

Order of tissue of the oral mucosa from superficial to deep layers:

3 classifications of oral mucosa:

softer surface texture, moist and able to stretch, compress

rubbery surface texture and resilient (not stretchy)

lingual papillae

found in the lining mucosa, most common type of epithelium in the oral cavity, and consists of new layers

What are the layers from deep to superficial of the nonkeratinized stratified squamous epithelium?

Deepest layer of the nonkeratinized stratified squamous epithelium. A single layer of cells that sit above the basement membrane and have two functions, which are: produce the lamina lucida of the basement membrane; and produce new epithelial cells by mitosis - no more mitosis occurs once you leave this layer

Middle layer of nonkeratinized stratified squamous epithelium. Cells have migrated superficially from the basal layer; this layer makes up the bulk of the epithelium

top layer of nonkeratinized stratified squamous epithelium. Cells have continued to migrate and they've gotten flatter as they move up. Now they are squames. They die and are shed from the tissue

What are the layers of the orthokeratinized stratified squamous epithelium from deep to superficial?

epithelium found in the masticatory mucosa. It is the least common in the oral cavity.

deepest layer of the orthokeratinized stratified squamous epithelium. a single layer of cells lying above the basement membrane, it produces that lamina lucida of the basement membrane, and produces new epithelial cells by mitosis, there is no more mitosis once you leave this layer

similar to the intermediate layer. When you dry it out (to look under a microscope), the cells shrink, but maintain their desmosomes. This layer makes up the bulk of the orthokeratinized stratified squamous epithelium

similar to the intermediate layer. In these cells, we see the keratohyaline granules that will eventually keratinize the cell in orthokeratinized stratified squamous epithelium

similar to the superior layer. They've migrated to the top, flattened out, and filled with keratin, so they have NO NUCLEI. The keratin cells die and are shed from the tissue. most superficial layer in the orthokeratinized stratified squamous epithelium.

found in the masticatory mucosa. More common than orthokeratinized tissue. This is exactly the same as orthokeratinized stratified squamous epithelium, except the keratin cells HAVE NUCLEI. They are on their way to loose the nucleus, but they are shed before they do.

Name 3 different types of epithelium of the oral mucosa

The tall narrow papilla pulling on the epithelium. Means gums are very healthy. It looks kind of like an orange peal

the scalloped division between the attached gingiva and the alveolar mucosa

very normal pigmentation. Just like the melanin that gives your skin color, it can give color to the oral mucosa. More common in patients with darker skin (more melanin)

Turn over time for oral mucosa is _________/

____________- repairs epithelium. ______________- repairs connective tissue.

true or false. too much granulation tissue can get in the way and cause problems, so you may have to remove it.
True False

5 types regions of the oral cavity where lining mucosa is found

2 regions of the oral cavity where masticatory mucosa is found