Oral Cavity Flashcards
Roof of oral cavity
Palate
Floor
Tongue and oral mucosa
Suppported by mylohyoid and geniohyoid
Anterior and lateral boundaries
Lips and cheeks
Posterior boundary
Oropharyngeal isthmus, demarcated by palatoglossal arch
Two parts of oral cavity
- Oral vestibule
2. Oral cavity proper
Oral vestibule
Lies between lips and gums (external to teeth)
Openings into oral vestibule
- Labial glands
2. Parotid duct
Labial glands
Small salivary glands
Parotid duct
Opens lateral to maxillary second molar in vestibule
Oral cavity proper
Portion of oral cavity internal to tooth rows
Philtrum
Median groove seen externally, extends from nose to vermilion border of upper lip
Frenulum
Connects lip to corresponding gum by a median fold
Upper and lower
Lips contain
Orbicularis oric muscles and labial glands
Cheeks contain
Buccinator muscle and buccal glands
Palate form
Roof of mouth and floor of nasal cavity
Hard palate
Anterior 2/3 of palate (bone)
Soft palate
Posterior 1/3 of palate (muscle, aponeurosis, mucous membranes)
Hard palate consists of
- Palatine process of maxilla (anteriorly)
2. Horizontal plate of palatine (posteriorly)
Foramina of hard palate
Incisive foramen
Greater palatine foramen
Lesser palatine foramen
Hard palate covered by
Mucoperiosteum
Transverse palatine folds
Extend laterally within in mucoperiosteum
Transverse palatine folds function
Aid in gripping food against tongue during mastication
Soft palate is formed by
Mucous membrane covering aponeurosis
Soft palate is elevated during swallowing to close opening between ______ and ________ during swallowing.
Nasopharynx (above)
Oropharynx (below)
Soft palate is continuous with these two arches
- Palatoglossal arch
2. Palatopharyngeal arch
Palatoglossal arch made up of
Palatoglossal fold
Palatoglossus muscle
Palatopharyngeal arch
Palatopharyngeal fold
Palatopharyngeus muscle
Median projection of soft palate
Uvula
Tonsillar fossa contains
Palatine tonsil
Muscles of soft palate
Musculus uvulae
Levator veli palatini
Tensor veli palatini
Innervation of hard palate
Greater palatine and nasopalatine
Innervation of soft palate
Lesser palatine nerve
Hard palate blood supply
Greater palatine artery
Soft palate blood supply
Lesser palatine and facial arteries
Diagnosis of nerve damage to the palate
Uvula deviates to the opposite of nerve damage
- deviates to left = right nerve damage
Tongue is attached to what structures
Hyoid bone Mandible Styloid process Palate Pharynx
Functions of the tongue
- Taste
- Mastication
- Swallowing
- Speech
Parts of tongue
Apex Margin Dorsum Inferior surface Root
Sulcus terminalis
V shaped groove
Sulcus terminalis divides tongue into
Oral part (ant 2/3) Oropharyngeal part (post 1/3)
Foramen cecum location
Located at apex of V of sulcus terminalis
Foramen cecum is the remnant of what embryonic structure
Thyroglossal duct
4 types of lingual papillae
- Filiform papillae
- Fungiform papillae
- Vallate papillae
- Foliate papillae
Which papillae contain taste buds
Fungiform
Vallate
Foliate
Papillae that are general sensory only
Filiform papillae
Largest of lingual papillae
Vallate papillae
Mushroom shaped papillae
Fungiform
Papillae arranged into a V shaped row in front of sulcus terminalis
Vallate
Grooves and ridges along margin of tongue
Foliate papillae
Lingual tonsil location
Oropharyngeal surface of tongue
Two folds that connect tongue to epiglottis
Median glossoepiglottic fold
Lateral glossoepiglottic fold
Vallecula
Space on either side of medial glossoepiglottic fold
Inferior surface of tongue connected to floor of mouth by
Frenulum of tongue
Intrinsic muscles of tongue characteristics
- Origin and insertion in tongue
- Alter shape of tongue
- Innervated by hypoglossal nerve
Nerves, vessels and extrinsic muscles enter or leave tongue through
Root of the tongue
Extrinsic muscles of the tongue
- Genioglossus
- Hyoglossus
- Styloglossus
- Palatoglossus
Palatoglossus innervation
Vagus nerve via pharyngeal plexus
Extrinsic muscles of tongue supplied by
Hypoglossal nerve
**EXCEPT palatoglossus
General sensation to anterior 2/3 of tongue
Lingual nerve— mandibular branch of trigeminal
Taste to anterior 2/3 of tongue
Chorda tympani, branch of facial nerve
Posterior 1/3 of tongue innervation
Glossopharyngeal nerve
**both general sensation and taste
Blood supply to tongue
Lingual artery and vein
Lymph nodes of tongue
Submental, submandibular, and deep cervical nodes
Hardest substance in human body
Enamel
Substance that covers the crown of the tooth
Enamel
Dentin
Internal to enamel
Pulp of the tooth
Central cavity of tooth
Where blood vessels, nerves and lymphatics sit in a tooth
Pulp
Cementum
Bone-like; covers the root
Gingivae
Gums- Oral musosa that surrounds teeth and covers alveolar bone
Part of tooth embedded in alveolar processes of maxilla and mandible
Root
Incisor characteristics
Single rooted
Chisel-shaped
Cutting
Canine characteristics
Single rooted
Pointed
Puncturing and tearing
Premolars
Single or double rooted
Broad chewing surface
Grinding
Molars
Multiple rooted
Broad chewing surface
Grinding
Labial surface
Incisors and canines
Side facing lip
Buccal surface
Premolars and molars
Side facing cheek
Lingual surface
Side facing tongue
Mesial surface
Side facing anteriorly or toward midline
Distal surface
Side facing posteriorly or away from midline
Occlusal surface
Chewing surface
Deciduous teeth in each quadrant
2 incisors
1 canine
2 molars
(20 total)
Permanent teeth in each quadrant
2 incisors
1 canine
2 premolars
3 molars
(32 total)
Deciduous molars replaced by
Premolars
Maxillary teeth innervated by
Superior alveolar branches from maxillary division of trigeminal
Mandibular teeth innervated by
Inferior alveolar nerve from mandibular division of trigeminal