510-4 Oral Cavity Epithelia Flashcards
What type of epithelium is normal skin?
Stratified Keratinized Squamous
Name two main characteristics of epidermis.
Avascular and Innervated
think paper cut
What’s the difference between an apocrine and eccrine gland?
sweat gland at the hair follicle (apocrine) or on the skin’s surface (eccrine).
In nanometers, what is the thickness of thick and thin skin?
400-600 nm for thick
75-150 nm for thin
What’s the most abundant cell in the epithelium?
Keratinocytes - By far
What are the three histologically distinguishing features of the lip?
Hair follicles and sebaceous glands on outside.
Vermillion border has THIN epithelium with no hair/glands
Oral Mucosa is thicker epithelium with glands
Where is a Meisner’s Corpuscle found?
Vermillion border of the lip
amplifies innervation
Does the Vermillion Zone have a stratum granulosum? Why?
Yes. The stratification shows distinct layers of keratinization, and the epidermis if fully keritinized and lacks nuclei.
Describe the top-layer nuclei in the mucosa.
It is either parakeratinized of non-keratinized.
Therefore, nuclei will be found from base to surface.
What distinguishes parakeratinization?
Dark, round nuclei at the surface
PYKNOTIC
Name three things comprising the mucosa.
Epithelium Lamina Propria (the loose CT) Muscularis Mucosa (thin layer of smooth muscle tissue)
What is below the mucosa
The submucosa - loose connective tissue
Despite the oral mucosa being either non-keratinized or parakeratinized, what is the most common cell in the epithelium?
Keratinocytes - but exhibit degrees of keratinization
The lamina propria in the oral mucosa is equivalent to what layer in the skin?
The dermis (vascular and innervated with connective tissue)
How is the oral mucosa different from other mucosa
No muscularis mucosa (this layer does not exist in the mouth)
So, the layer below the lamina propria (dermis equiv) is the submucosa
What’s the term for highly defined layers of maturation throughout the mucosal epithelium?
Ortho-keratinized
What are the three types of Oral Cavity mucosa?
Masticatory, Lining, and Specialized
gingiva and hard palate / alveolar (below gingiva) labial, buccal, mouth floor, soft palate / tongue surface
Histologically describe Lining Mucosa.
Non-keratinized stratified squamous epithelium
Lamina Propria is loose
Permeable due to lack of keratinization (sub-lingual)
Histology - difference between para k and keratinized
Para K has no granular layer and Pyknotic nuclei
K has granular layer and no nuclei on surface
Both can be in hard palate
Name the five areas of Gingiva
Attached, Free, Margin, Sulcular, and Junctional
What’s special about Junctional Gingiva?
Has a second layer of Basal Lamina that attaches to dentin.
Where is Specialized Oral Mucosa found?
Found on the dorsal side (upper side) of the tongue.
What are the three basic types of mucosa?
Masticating, Lining, and Specialized
