DEH 103: Histology & Embryology
Chapters 13 & 14: Temporomandibular Joint and Oral Mucosa
Chapters 13 & 14: Temporomandibular Joint and Oral Mucosa
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| Karten | 36 |
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| Sprache | English |
| Kategorie | Medizin |
| Stufe | Universität |
| Erstellt / Aktualisiert | 02.01.2014 / 03.01.2014 |
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The TMJ allows for?
- Movement of the mandible for:
- Mastication
- Speech
- Respiratory movements
This is positioned anterior to the articular fossa and consists of a rounded protuberance on the inferior aspect of the zygomatic process of the temporal bone.
Articular eminence / tubercle
This is posterior to the articular eminence. It consists of a depression on the inferior aspect of the temproal bone, posterior and medial to teh zygomatic arch.
Articular fossa / mandibular fossa
The condyle consists of ____ overlying cancellous bone. The _____ overlies te compact bone of the condyle. The ____ overlies the periosteum.
- Compact bone
- Periosteum
- Fibrocartilage
What are the 2 compartments of the TMJ articulating disk? What are the 2 movements of the TMJ and what compartment completes each movement?
- Upper compartment: gliding action
- Lower compartment: hinge action
What are the 4 arteries that supply the TMJ?
- Superficial temporal
- Deep auricular
- Anterior tympanic
- Ascending pharyngeal
True/False:
There is no blood vessels that supply the head of the condyle.
True
What nerve supplies the TMJ?
- Mandibular division (3rd) of the trigeminal nerve
- Auriculotemporal
- Masseteric
- Deep temporal
What are the 4 muscles of mastication?
- Temporalis: elevates the jaw, clinches the teeth, and assists in side to side movement of the jaw.
- Masseter: elevates the jaw, clinches the teeth, and assists in side to side movement of the jaw.
- Medial pterygoid: protracts and elevates the mandible
- Lateral pterygoid: functions to protrude the mandible and pull the articular disk foward.
What are the 3 types of oral mucosal tissue?
- Lining mucossa: covers the floor of the mouth, cheecks, lips, and soft palate. Soft, pliable, and non-keratinized.
- Masticatory mucosa: covers the hard palate and alveolar ridge. Keratinized, firm tissue, contacts food during mastication.
- Specialized mucosa: covers the surface of the tongue. Composed largerly of cornified epithelial papillae.
What are the 3 layers of epithelium?
- Stratum basale
- Stratum intermedium
- Statum superficiale
What general histological features of the oral mucosa allows for movement during speech, mastication, and swallowing?
- Submucosa: deep tissue that allows for compresssion of the tissue. It overlyes the muscle
- Elastic fibers: in lamina prorpia alowes for movement
This is the junction of the oral mucosa and the skin of the lips. What causes it to be red?
- Vermillion border
- Red:
- Epithelium is thin and contains eleidin which is transparent
- Blood vessels are close to the surface
This is the shiny, moist resion that is extreamly mobile. It lines the vestibules of the oral cavity.
Alveolar mucosa (lining mucosa)
What are the 4 layers of the masticatory mucosa?
- Stratum basale
- Stratum intermediate (stratum spinosum)
- Stratum granulosum (contains keratohyalin granules -- keratin)
- Stratum corneum (no nuclues and cell is filled with keratin)
What are the 3 zones of masticatory mucosa of the gingiva?
- Free or marginal gingiva
- Attached gingiva (usually stippled)
- Interdental groove / zone / papilla
What is the division between free and attached gingiva called?
Free gingival groove
This is the separation of attached gingiva and the nonkeratinized alveolar mucsa.
Mucogingival junction
What causes stippling?
Rete pegs: they are tissue attachment points
What is the most common cell type in the lamina prorpia?
Connective tissue (fibroblasts)
Which type of mucsa (lining / masticatory) has more rete pegs to allow for a firm base for speech and mastication?
Masticatory mucsoa
Why does the linig mucsoa not have as many rete pegs and connective tissue papillae?
So it can be streached more for speech, mastication, and swallowing
This is where the tissue is attached to the tooth.
Juncational epithelium
What are the turnover rates for the oral mucsa and which takes the longest, which takes the shortest amount of time?
- Hard palate: 24 days (*)
- Floor of mouth: 20 days
- Buccal and labial mucosa: 14 days
- Attached gingiva: 10 days
- Taste buds: 10 days
- Junctional epithelium: 4-6 days (**)
- (*): hard palate takes the longest
- (**): junctional epithelium takes the least
What are the most common sites for oral cancer?
- Floor of the mouth
- Soft palate
- Lower lip
- Lateral borders of the tongue
This is the nonkeratinized epithelium in the interproximal area between the papilla, a concave zone of the gingiva that follows the contour of each crown is known as the?
Col
These are ridges of tissue on either side of the invisive papilla.
Palatine rougae
These exist in the lamina propria to anchor the mucosa to the bone and help with mastication. They collegen fiber bundles.
Traction bands
This is the mucosa that covers the anterior 2/3rds of the tongue (dorsum, and ventral). What are the 4 types?
Specialized mucosa
- Filiform papillae: most numerous
- Fungiform papilla: mushroom shaped located more at the tip of the tongue
- Circumvallate papilla: V-shaped sulcus at the base of the tongue. contain von Ebner's glands
- Foliate papilla: lateral posterior sides of the tongue. look like gills.
Where are taste buds found?
- Fungiform papillae
- Circumvallate papillae
- Foliate papillae
- Soft palate
- Epiglottis
- Larnyx & Pharynx
- Oropharynx
What are the 4 types of tates sensation?
- Sween: tip of tongue
- Salty: tip and sides of tongue
- Sour: sides of tonue
- Bitter: soft palate and circumvalate papillae
These epitheilal cells do not contain keratin. What are the 3 types?
Epitheilial Nonkeratinocytes
- Langerhans' cells
- Merkel's cells
- Melanocytes
- Lympocytes
- Leukocytes
This epitheilial nonkeratniocyte is found int he stratum spinosum and it function in immune response.
Langerhans cells
This epitheilal nonkeratinocyte is located int he basal layer, and is associated with the terminal axon (touch receptor).
Merkel's cell
These epitheilal nonkeratinocyte is located in the basal layer and produces melanin.
Melanocytes
What are signs of the aiging gingiva?
- Reduction in stippling
- Increased fordyce's granules
- Enlarged lingual veins
- Epitheilum becomes thinner
- Decrease saliva production
- Healing time increases
- Apical migration of the gingiva
