Week 5 Oral mucousa Flashcards
Another name for Laminae Propier
Dermis
ORAL MUCOSA
Stratified Squamous epithelium
• The oral mucosa is composed of stratified squamous epithelium overlying a layer of connective tissue proper (aka lamina propria). There may be a deeper layer of submucosa present.
The submucosa of the cheek contains:
C. Adipose tissue and minor salivary glands.
Basement membrane
• The basement membrane lies between the epithelium and lamina propria in the oral mucosa.
3 main types:
• Lining mucosa
• Masticatory mucosa
• Specialized mucosa
Lining mucousa
• Contains:
- elastic fibers which provide tissue with a movable base.
- submucosa under lamina propria which allows for compression of tissue during chewing (mastication), speech, and swallowing.
Soft pliable - nonnkertanized squamous epithelium
Lamina dermis -smoother fewer
• Where can we find
Lining mucosa?
• A. Buccal
•B. Floor of the mouth
• C. Alveolar mucosa
• D. Soft Palate
•E. All of the above
E
• What type of epithelium is
Lining Mucosa consist of?
• A. non-keratinized stratified squamous epithelium
•B. Simple Cuboidal epithelium
• C. Columnar Epithelium
•D. Keratinized stratified squamous a
A
Floor of mouth
• Non-keratinized, thin.
• Lamina Propria:
- extensive vascular supply, broad connective tissue papillae.
• Submucosa includes:
- submandibular and sublingual salivary glands.
- loosely attached to bone/muscles.
Cheeks
•Non-keratinized stratified squamous epithelium.
• Lamina propria has extensive vascular supply.
• Submucosa contains adipose tissue and minor salivary glands.
(provide compressibility and moisture,
respectively)
Alveolar Mucousa
•Extremely mobile, lines the vestibules of the oral cavity.
• Extremely mobile, lines the vestibules of the oral cavity.
• Lamina propria has an extensive vascular supply
Mandibular
making the mucosa more red than the buccal mucosa.
•Lots of elastic fibers in the lamina propria making the tissue mobile.
Lips
• Non-keratinized squamous epithelium (inner lips).
• Lamina propria contains
minor seromucous salivary glands.
D
• Submucosa contains muscle fibers of the orbicularis oris muscle.
•Vermilion border is the junction between the oral mucosa and the skin of the face.
• Contains eleidin (clear, semi fluid, intracellular protein) so the blood vessels of the papillary layer transpire through making the color of the lips pink/red.
Free gingiva is found between free gingival groove and mucogingival junction:
False it’s attached not to free but attached
SOFT PALATE
• Non-keratinized stratified squamous epithelium.
• Lamina propria is highly vascularized.
• Submucosa contains muscles of the soft palate and mucous glands, (minor salivary glands).
Masticatory
MASTICATORY MUCOSA
• Parakeratinized and orthokeratinized stratified squamous epithelium (least common).
• Covering: attached gingiva, dorsal surface of tongue and hard palate.
• Thicker, rubbery surface texture, resilient with keratin, firm base aids in speech and mastication.
• Abundant, pronounced rete ridges (prickle cell layer) and connective tissue papillae provides firm base.
• Submucosa is thin or absent.
• Sutures are rarely needed; local anesthetic injections mav be more difficult and cause greater discomfort than those in lining
mucosa.
GINGIVA AND EPITHELIAL
ATTACHMENT
• From the edge of free gingiva to mucogingival junction.
• Gingiva is divided into:
- Free gingiva (marginal zone).
- Attached gingiva.
- Interdental gingiva (papilla).
FREE AND ATTACHED GINGIVA
Free Gingiva:
-Inner margin - gingival sulcus
-Outer margin - oral cavity
-Keratinized and smooth.
Attached Gingiva:
-Between free gingival groove and mucogingival junction
-Keratinized and stippled, “orange peel” appearance.
Alveolar mucosa is not keratinized
Hyperkeratinization
Hyperkeratinization
• Non-keratinized tissue can become keratinized.
• Tissue response to frictional or chemical trauma (chronic trauma).
• Examples:
- Linea alba on buccal mucosa (a line showing where max and mand teeth occlude).
- Frictional keratosis (tissue response to bruxism (teeth grinding) or habitual cheek biting).
- Gingival fibrosis (toughening of the gums).
Tongue
A thick muscular organ that occupies the floor of the mouth and fills the oral cavity.
Anterior 2/3rd (body of tongue) is composed mostly of skeletal muscle.
• Posterior 1/3rd (root of the tongue) is anchored to the hyoid bone and is covered with lingual tonsils.
• Connected to the floor of the mouth.
• Papillae provide friction for handling food and contain taste buds.
I
• Aids in mixing food with saliva and moving it towards the pharynx.
• 1. What are deposite of sebum from misplaced sebaceous glands in the submucosa found on our lips or buccal mucosa called?
• A. sebaceous granules
B. Buccal salivary glands
• C. Fordyce granules
• D. Pigmentation
C
2.
is the junction between the oral
mucosa and the skin of the face
• A. Vermillion Border
• B. Eleidin
• C. Submucosa
• D. Melanin
A
Pop Quiz # 3
• 1. Parakeratinized epithelium has NO nuclei. T/F
F
• 2. Masticatory mucosa covers the:
• A. hard palate
• B. Soft Palate
• C. Attached Gingivae
• D. Dorsal surface of tongue
• E. A, C,D
E
Tongue pic
• 1. T/F Alveolar Mucosa is keratinized.
F
non keritanized
• 2. What are some characteristics of attached gingivae?
• A. stippled/keratinized
• B. Shiny and smooth
• C. Blue in color
• D. Between free gingival groove and mucogingival junction
• E. A and D
E
Dorsal surface
Specialized mucosa on anterior 2/3rd of tongue
4 types of papillae:
1. filiform papillae
2. fungiform papillae
3. foliate papillae
4. circumvallate papilla
Papillae
FILIFORM PAPILLAE (pg. 117)
• Make up the majority, most common, located on the dorsal surface of the tongue.
• They look like fine pointed cones, 2-3 mm in height, with the tips pointing towards the throat.
• Slender, threadlike, with a thick layer of ortho/parakeratinized epithelium overlying core of lamina propria.
• They give the tongue its velvet-like texture.
FUNGIFORM PAPILLAE
• Less numerous, most are located on the body of the tongue on the dorsal surface.
• Appear as reddish dots on the tongue.
• Mushroom shaped (cap larger than the stalk) with a thin layer of orthokeratinized or parakeratinized epithelium overlying highly vascular lamina propria.
• Function: taste sensation (taste buds are found in the superficial layers ).
FOLIATE PAPILLAE
• 4-11 vertical, parallel ridges found on the lateral (side) posterior surface of the tongue.
• Leaf-shaped, lined with ortho/parakeratinized epithelium overlying core of lamina propria.
• Taste buds are located in the superficial layers.
• Function: taste sensation.
CIRCUMVALLATE PAPILLAE
• 7 to 15 raised, mushroom shaped large papillae (3 to 5 mm), ortho/parakeratinized epithelium overlying a core of lamina propria.
• Located along a v-shaped sulcus between the body and the base of the tongue.
• Each has a surrounding groove where the ducts and minor salivary glands are located (Von Ebner’s glands).
- watery secretions wash the tongue so new tastes can be perceived.
• Function: taste sensation.
- hundreds of taste buds line the wall of the papilla.
Taste Buds
TASTE BUDS
• Microscopic barrel shaped bodies derived from epithelium, composed of 30 to 80 spindle shaped cells.
• Found in the oral epithelium, mainly the tongue but some on soft palate!!!
• Dissolved molecules of food contact the taste receptors at the taste pore (opening of taste bud).
• Taste cells are associated with sensory neuron processes which receive messages of taste sensation through the receptors.
- the message is sent to CNS to be identified as certain type of taste.
• Four fundamental taste sensation: sweet, sour, salty, and bitter.
• Rapid turnover rate: about 10 days.
Which papillae have a very vascular lamina dura and appear as reddish dots on the dorsal of the tongue?
• A. Fungiform
• B. Filliform
• C. Circumvallate
• D. Papillae
A
• Which Papillae have no taste buds?
• A. Fungiform
•B. Filliform
• C. Circumvallate
• D. Papillae
B
Blank
papillae are located on lateral borders of tongue:
D. Foliate
Filiform papillae have taste buds:
False
Toronio College
of Dental tyricot
Turnover Time, Repair and Aging (Table 9-6, pg. 120)
• Highest Turnover time - Junctional Epithelium
(4-6 days).
• Lowest Turnover time - Hard Palate (24 days).
• Lining mucosa turns over faster than masticatory mucosa.
• Turnover time - helps to determine healing rates and recovery times from damage.
• T/F Circumvallate papillae are surrounded by the Whartons salivary gland.
F
the von ebners
• Taste buds are found on the:
• A. Tongue
• B. hard palate
• C. Soft palate
• D Buccal Mucosa
• E. A and C
E
1- lingual tonsil
2-cicumvallate
3-Foliate
4-fungi form
5-filiform
