Prelim | Mouth Flashcards
Other term for the mouth
Buccal/ Oral Cavity
The mouth is formed by:
Cheek
Lips/ Labia
Hard and Soft Palate
Tongue
Compositions of the mouth
Oral vestibule
Oral cavity proper
Forms the lateral walls of the oral cavity
Cheeks
Location of the cheek
External: Skin
Middle: Buccinator muscle and connective tissue
Internal: Mucous membrane (nonkeratinized stratified squamous epithelium)
Fleshy folds surrounding the opening of the mouth
Lips/ Labia
External, middle, and internal composition of the lips
External: Skin
Middle: Orbicularis oris muscle
Internal: Mucous membrane
Middline fold of mucous membrane that attaches each lip to the gums
Labial frenulum
Forms the roof of the mouth
Soft and hard palate
The palates are covered by what?
Mucous membrane
Hard palate vs Soft palate
Hard palate
- Anterior portion
- Forms bony partition between oral and nasal cavities
Soft palate
- Posterior portion
- Arch-shaped muscularis pertition between nasopharynx and orophayrnx
Cleft palate vs cleft lip
Cleft palate: Interior
Cleft lip: Exterior
Conical muscular process
Uvula
During swallowing, these moves superiorly, closing off the nasopharynx and preventing swallowed foods and liquids from entering the nasal cavity
Soft palate and uvula
Lateral to the base of the uvula are two muscular folds that run down the lateral sides of the soft palate, namely:
- Palatoglossal arch
- Palatopharyngeal arch
Palatoglossal arch vs Palatopharyngeal arch
Palatoglossal arch: Anterior, Palate to tongue
Palatopharyngeal arch: Posterior, Palate to pharynx
Tonsils
- Palatine tonsils
- Lingual t onsils
- Adenoids/ Pharyngeal tonsils
What types of muscle is the tongue composed of?
Skeletal muscle
Space between the two muscular folds of the mouth
Fauces
Muscles of the tongue
Extrinsic muscle
Intrinsic muscle
Function of the extrinsic muscles of the tongue
Move the tongue from side to side and in and out to maneuver food for chewing
Function of the intrinsic muscles of the tongue
Alter the shape and size of the tongue for speech and swallowing
Act of swallowing
Deglutition
Where is the lingual frenulum located?
Between the tongue and floor of the mouth
Condition where the lingual frenulum is abnormally short; said to be tongue-tied
Ankyloglossia
What do papillae contain?
- Taste buds (receptors for gustation/ taste)
- Receptors for touch
Receptors for gustation
Taste buds
Increase friction between the tongue and food, making it easier for the tongue to move food in the oral cavity
Papillae
Five primary tastes that can be distinguished
Salty, sour, sweet, bitter, and umami
Forms of papillae
- Filiform
- Fungiform
- Circumvallate
- Foliate
Form an inverted V-shaped row at the back of the tongue. Each of these papillae houses 100–300 taste buds.
Circumvallate papillae
Mushroom-shaped elevations scattered over the entire surface of the tongue that contain about five taste buds each.
Fungiform papillae
Located in small trenches on the lateral margins of the tongue, but most of their taste buds degenerate in early childhood
Foliate papillae
The entire surface of the tongue has these papillae which are pointed, threadlike structures containing tactile receptors but no taste buds. They increase friction between the tongue and food, making it easier for the tongue to move food in the oral cavity
Filiform papillae
Other name for teeth
Dentes
Parts of the teeth
- Crown
- Neck
- Root
The visible portion of the teeth above the level of the gums
Crown
Part of the teeth that are embedded in the socket
Roots
Shortest part of the tooth
Neck
Longest part of the tooth; contains nerves and blood vessels
Roots
Other term for the gums
Gingiva
Outer layer of gingiva
Periodontal ligament
The dentin of the crown is covered by —, which consists primarily of calcium phosphate and calcium carbonate.
enamel
Bone that encloses each tooth
Alveolar bone
The branch of dentistry that is concerned with the prevention, diagnosis, and treatment of diseases that affect the pulp, root, periodontal ligament, and alveolar bone
Endodontics
Branch of dentistry that is concerned with the prevention and correction of abnormally aligned teeth
Orthodontics
Branch of dentistry concerned with the treatment of abnormal conditions of the tissues immediately surrounding the teeth, such as gingivitis (gum disease)
Periodontics
Sets of teeth
Dentitions
Two dentitions
- Deciduous teeth/ primary teeth/ milk teeth/ baby teeth
- Permanent
Deciduous teeth begin to erupt at about (1) of age, and approximately two teeth appear each month thereafter, until all (2) are present
- 6 months
- 20 (10 sa baba, 10 sa taas)
All of the deciduous teeth are lost—generally between ages (1) and (2)—and are replaced by the (3) (secondary) teeth
- 6
- 12 years
- permanent
Permanent dentition contains (1) teeth that erupt between age (2) and (3).
- 32
- 6
- adulthood
Types of permanent dentitions, and how many are present
- Incisors: 4pairs, 8
- Canine (cuspids): 2 pairs, 4
- Molars: 6 pairs, 12 (wisdom tooth included)
- Premolars: 4 pairs, 8
Function of the incisors
Cuts the food
Function of the canines (cuspids)
Tearing and shredding food
Function of the molars
Crushing and grinding
Function of the premolars
Crushing and grinding
How many roots do permanents dentitions have?
Incisors and Canines: 1 root
Maxillary molars: 3 roots
Mandibular molars: 2 roots
Often the human jaw does not have enough room to accommodate the eruption of the third molars. The third molars remain embedded in the alveolar bone and are said to be —. They often cause pressure and pain
impacted tooth
Salivary gland secretes mucous for:
- moistening and cleansing mouth and teets
- lubricates, dissolves, and begins the chemical breakdown of food
2 Groups of the salivary gland
- Major salivary gland
- Small salivary gland
Small salivary glands
- Labial gland
- Buccal gland
- Palatal gland
- Lingual gland
Major salicary glands
- Parotid gland
- Submandibular gland
- Sublingual gland
Largest salivary gland
Parotid gland
When eating, saliva comes from —
major salivary glands
How many saliva is produced per day?
1000-1500ml
The openings through which saliva enters the mouth
salivary ducts
Salivary ducts
- Parotid (Stensen’s) duct
- Submandibular (Wharton’s) duct
- Sublingual (Bartholin’s) duct
Parotid (stensen’s) duct secretes —of saliva
10-30%
Fluid released by parotid (stensen’s) duct
serous liquid (amylase)
This duct is located infero-anteriorly to the ears between skin and masseter muscle
parotid (stensen’s) duct
Submandibular (Wharton’s) duct secretes — of saliva
70%
Fluid released by submandibular duct (wharton’s)
Serous and thickened mucous
This duct is located medially and partly inferior to the body of the mandible
Submandibular (wharton’s) duct
Sublingual duct (bartholin’s/ rivinus duct) secretes — of saliva
5%
Fluid released by sublingual duct (bartholin’s/ rivinus duct)
small amount of serous and mucous
This duct is located beneath the tongue, superior to smg (submandibular gland)
sublingual duct (bartholin’s/ rivinus duct)S
Composition of saliva
95% water
5% solutes
Less than 1% gases and organic substances
Solutes in the saliva
Phosphate
Sodium
Potassium
Chloride
Bicarboanre
Gases and organic substances in the saliva
Urea and uric acid
Mucus
Immunoglobulin A
Lysozyme
Salivary Amylase
Act of chewing
Mastication
Food that has been chewed and mixed in the mouth with saliva
Bolus