Head: Oral Cavity, Palate, and Tongue Flashcards
2 parts of the oral cavity
- Oral cavity proper
- Oral vestibule: between teeth/gums and lips/cheek
Oral cavity contains
- Teeth
- Gingivae
- Tongue
- Palate: roof of oral cavity
Lips and cheeks are covered internally/externally by
- Skin externally
- Mucous membrane internally
Lips contain
- Orbicularis oris
Cheeks contain
- Buccinators
Lips are
- Transition between external skin and inner oral mucosa
Blood supply of the lips
- Labial vessels
Cutaneous nerve supply of the lips
- Upper lip is V2 (infraorbital nerve)
- Lower lip is V3 (mental nerve)
Blood supply of cheeks
- Buccal branch of maxillary
Nerve supply of cheeks
- Buccal nerve from V3
Oral surface of the cheeks contains
- Buccal glands (salivary)
Cheeks contain buccal fat pad between
- Skin and buccinators muscle
Palate is formed by
- Hard and soft palate
- Separates oral cavity from nasal cavity and nasopharynx
- Roof of oral, floor of nasal
Hard palate (anterior 2/3)
- Concave, bony skeleton
- Palatine process of maxilla
- Horizontal plate of palatine bone
Openings of the palate (3)
- Incisive foramen and fossa
- Greater palatine foramen
- Lesser palatine foramen
Incisive foramen and fossa contains
- Nasopalatine nerve
- Sphenopalatine artery
Greater palatine foramen contains
- Greater palatine nerve and vessels
Lesser palatine foramen contains
- Lesser palatine nerve and vessels
Soft palate (continuous with pharynx) contains/function
- Aponeurosis
- Uvula
- Tenses and elevates during swallowing
Soft palate aponeurosis attaches to
- Posterior hard palate
Uvula
- Cone shaped free margin of soft palate
Tensing and elevating during swallowing closes the
- Isthmus of pharynx
Continuity of soft palate with pharynx forms
- Palatoglossal arches
- Palatopharyngeal arches
Oropharyngeal Isthmus (Isthmus of Fauces) is between
- Oral cavity
- Oropharynx
Oropharyngeal Isthmus (Isthmus of Fauces) is bound by
- Soft palate
- Tongue
- Pillars of the fauces (the arches)
Oropharyngeal Isthmus (Isthmus of Fauces) contains
- Palatine salivary glands
- Transverse palatine folds (rugae)
- Palatine raphe
Palatine raphe
- Site of embryonic fusion of 2 halves of the palate
Muscle of the soft palate functions
- Elevate, depress, and tense soft palate
All muscles of the soft palate (except 1) are innervated by
- Vagus nerve (via pharyngeal plexus)
Tensor veli palatini extends from
- Scaphoid fossa and pharyngotympanic tube cartilage
- To palatine aponeurosis
Tensor veli palatini innervation
- Mandibular nerve
Tensor veli palatini function
- Tenses soft palate
- Opens Eustachian tube
Levator veli palatini extends from
- Cartilage of pharyngotympanic and temporal bone (petrous bone)
- Topalatine aponeurosis
Levator veli palatini function
- Elevates soft palate
Palatoglossus function
- Elevates posterior tongue
- Depresses soft palate
Palatopharyngeus function
- Elevates pharynx
- Tenses and depresses palate
Musculus uvulae function
- Shortens and elevates uvula
Blood supply of the palate (4)
- Maxillary artery
- Descending palatine artery
- Lesser/greater palatine artery
- Sphenopalatine artery
Descending palatine artery passes through
- Greater palatine canal
Nerve supply of the palate
- Nasopalatine nerve
- Greater/lesser palatine nerves
General sensory of the palate provided by
- Branches of maxillary nerve (V2)
Nasopalatine nerve enters the nasal cavity by passing through the
- Sphenopalatine foramen
Nasopalatine nerve enters cavity and travels along
- Travels along nasal septum
- Passes through incisive canal
Nasopalatine nerve exits cavity through
- Exits incisive canal through incisive foramen
- Inferior aspect of palate
Greater and lesser palatine nerves pathway
- Greater palatine canal
- Pass through greater/lesser palatine foramina to palate
Taste and parasympathetic to palatine glands
- Facial nerve
- Follow trigeminal branches
Tongue is a muscular organ involved in
- Speech
- Chewing
- Swallowing
- Sensation
Root of the tongue is the inferior/posterior portion attached to
- Mandible
- Hyoid bone
- Tongue muscles
Body of the tongue
- Anterior 2/3
Apex of the tongue
- Tip of the tongue
Dorsum of the tongue
- Superior surface
- Terminal sulcus
- Foramen cecum
Terminal sulcus of dorsum of tongue separates
- Anterior 2/3 (oral or presulcal part) from posterior 1/3 (pharyngeal or postsulcal part)
Lingual papillae location
- Dorsal anterior 2/3 of tongue
Types of lingual papillae
- Vallate
- Foliate
- Fungiform
- Filiform
Vallate papillae
- Anterior to terminal sulcus
- Contain taste buds
Foliate papillae
- Post/lateral tongue
- Contain taste buds
Fungiform papillae
- Found on dorsum (most numerous at apex)
- Contain taste buds
Filiform papillae
- Numerous
- Mechanical/sensory function
- No taste buds
Posterior 1/3 of tongue
- Anterior wall of oropharynx
- No lingual papillae, does have taste buds
- Lingual tonsil
Tongue muscles function
- Do not act in isolation
- Lingual septum separates halves
- Extrinsic muscles
- Intrinsic muscles
Extrinsic tongue muscles
- Position the tongue
- Alter shape
- Originate outside of the tongue
Intrinsic tongue muscles
- Alter the shape
- Originate within the tongue
Muscles of the tongue
- Genioglossus
- Hyoglossus
- Styloglossus
- Palatoglossus
Genioglossus attachments
- Superior mental spine to tongue (also hyoid bone)
Genioglossus functions
- Proturudes
- Depresses central portion
- Lateral deviation
Hyoglossus attachments
- Body of tongue
- Greater horn of hyoid to lateral tongue
Hyoglossus functions
- Depresses sides
- Retracts tongue
Styloglossus attachments
- Styloid process to sides of posterior tongue
Styloglossus functions
- Retracts and elevates sides
Palatoglossus attachments
- Palatine aponeurosis to posterolateral tongue
Palatoglossus functions
- Elevates posterior tongue
- Depresses soft palate
Motor innervation to tongue
- Palatoglossus innervated by vagus (pharyngeal plexus)
- All the rest innervated by hypoglossal nerve
Damage to hypoglossal nerve (trauma, malignancy) causes
- Paralysis and eventual atrophy
Nerve injury causes
- Tongue deviation to the paralyzed side during tongue protrusion
Anterior 2/3 tongue sensory innervation
- General sensation: CN V3, lingual nerve
- Special sensation (taste): CN VII, chorda tympani
Posterior 1/3 including vallate papilla
- General and special sensation: CN IX
Vagus can supply some taste and general sensation to
- Posterior tongue and epiglottis
Arterial supply to tongue
- Lingual artery
- Branch from ECA
- Passes deep to hyoglossus (medial to hyoglossus)
Branches from lingual artery
- Dorsal lingual
- Deep lingual
- Sublingual
Dorsal lingual supplies
- Root
Deep lingual supplies
- Body
Sublingual supplies
- Mouth floor
- Sublingual glands
Venous supply of tongue
- Deep Lingual
- Sublingual
- Dorsal Lingual
All tongue veins drain directly to
- IJV directly or to lingual vein
Sublingual drug administration
- Direct, quick absorption
- Excellent venous drainage
- Bypasses GI tract and liver
All lymph from tongue eventually reaches
- Deep cervical nodes
Root of tongue lymph drainage
- Superior deep cervical nodes bilaterally
Medial body of tongue lymph drainage
- Inferior deep cervical nodes bilaterally
Lateral body of tongue lymph drainage
- Ipsilateral submandibular nodes
Apex and frenulum of tongue lymph drainage
- Submental nodes
Salivary glands
- Moisten mouth
- Beginning of digestion
Glands of the tongue
- Salivary
- Parotid
- Submandibular
- Sublingual
Submandibular gland
- Superficial and deep parts
Submandibular duct (Whartons duct)
- Passes between mylohyoid and hyoglossus
- Lingual nerve is lateral, then loops beneath the duct (lateral, inferior, medial)
- Runs along floor of mouth to sublingual caruncle near frenulum
Sublingual glands
- Located floor of the mouth between mandible and genioglossus
- Multiple duct openings
Sublingual gland arterial supply
- Sublingual
- Submental
Sublingual gland innervation
- CN VII (secretomotor)
Submandibular gland arterial supply
- Submental (facial)
Submandibular gland innervation
- CN VII (secretomotor)
Minor salivary glands
- Buccal
- Palatal
- Labial
Parasympathetic innervation to submandibular and sublingual glands presynaptics
- Originate in pons
Pathway of parasympathetics to submandibular/sublingual glands
- Presynaptics originate in pons
- Travel in facial nerve (nervus intermedius)
- Follow chorda tympani into infratemporal fossa
- Chorda tympani joins with lingual nerve (V3)
- Presynaptics synapse in submandibular ganglion
- Postsynaptics innervate submandibular gland
- Some jump back on lingual to innervate sublingual gland
Presynaptics from pons travel in
- Facial nerve (nervus intermedius)
From the facial nerve, nerves follow
- Chorda tympani into infratemporal fossa
Chorda tympani joins with
- Lingual nerve (V3)
Presynaptics synapse in
- Submandibular ganglion
Postsynaptics innervate
- Submandibular gland
- Some jump back on lingual
Nerves that jump back onto lingual innervate
- Sublingual gland
Sympathetics of glands
- Postsynaptic nerve fibers from superior cervical ganglia
- Travel in periarterial plexus along ECA –> facial and lingual arteries to reach the gland
Taste pathway (anterior 2/3 of tongue)
- Tongue
- Lingual
- Chorda tympani
- Nervus intermedius
- Brainstem
submandibular ganglion is NOT involved in
- Tase
Geniculate ganglion contains
- Cell bodies for CN VII neurons for taste and sensation
Chorda tympani contains
- Presynaptic parasympathetics
- Taste afferents
Lingual nerve before chorda tympani joins
- General somatic afferents from oral cavity (including anterior 2/3 of tongue)
Lingual nerve BEFORE submandibular ganglion, after chorda tympani joins
- Presynaptic parasympathetics
- Taste afferents
- General sensory (touch, pain), V3
Lingual nerve AFTER submandibular ganglion, after chorda tympani
- Postsynaptic parasympathetics to sublingual gland
- Taste afferents
- General sensory (touch, pain), V3
Lingual and hypoglossal nerves pass
- Lateral to the hyoglossus muscle
Lingual artery passes
- Medial