Oral Cavity Flashcards
What are the tissue layers of the cheeks?
Skin (incl. Vermillion border and transition zone)
Muscle
Glands
Mucous Membranes (incl. Vestibular fold and Labial frenula)
What are the four types of papillae on the tongue?
- Filiform - no taste buds, numerous
- Fungiform - taste buds, globular, at tip and lateral margins
- Valiate - taste buds, makes V shape, contains most taste buds
- Foliate - taste buds, lateral surface
What branchial arch forms the body of the tongue?
First arch
What branchial arch forms the root of the tongue?
Third arch
What branchial arch forms the epiglottus?
Fourth arch
What nerve innervates the tongue muscles for somatic motor?
CN XII - Hypoglossus (except Palatoglossus (CN X))
What are the four types of intrinsic muscle fibers for the tongue?
Superior longitudinal - curls tongue and shortens
Inferior longitudinal - curls tongue and shortens
Vertical - flattens tongue
Transverse - narrows tongue
Superior Fibers of genioglossus
- Attachment
- Action
- Nerve
Attaches: Genial tubercles and body of tongue
Action: Retract tip of tongue
Nerve: CN XII
Middle fibers of genioglossus
- Attachment
- Action
- Nerve
Attaches: Genial tubercles and body of tongue
Action: Depress dorsum of tongue, protrude tongue
Nerve: CN XII
Inferior fibers of genioglossus
- Attachment
- Action
- Nerve
Attaches: Genial tubercles and hyoid
Action: Protrude tongue, advance hyoid
Nerve: CN XII
Hyoglossus
- Attachment
- Action
- Nerve
Attaches: Hyoid bone to lateral surface of tongue
Action: Retrude tongue and draw sides downward, raise hyoid
Nerve: CN XII
Styloglossus
- Attachment
- Action
- Nerve
Attaches: Styloid process, lateral surface of tongue
Action: Retrude tongue and draw sides upward
Nerve: CN XII
Palatoglossus
- Attachment
- Action
- Nerve
Attaches: Palatal aponeurosis to dorsum and lateral surface of tongue
Action: Elevate tongue, depress palate
Nerve: CN X
What is the arterial blood supply of the tongue?
External Carotid Artery
- Lingual a.
- Dorsal Lingual
- Deep Lingual
- Sublingual
What provides general sensory function of the Ant 2/3 of the tongue?
CN V3
Trigeminal ganglion -> foramen ovale -> infratemporal fossa -> lingual nerve branches from V3 and goes to tongue
What provides general sensory function of the Post 1/3 of the tongue?
CN IX and X - Glossopharyngeal and Vagus
Sensory fibers exit brain -> Jugular foramen -> sensory cell bodies of Sup/Inf Glossopharngeal and vasal ganglia -> tongue
What provides Special sensory (taste) of the Ant 2/3 of the tongue?
CN VII - Facial
Sensory fibers exit -> Int. acoustic meatus -> Geniculate ganglion -> facial canal -> Chordae tympani nerve through the middle ear -> petrotympanic fissure -> infratemporal fossa -> joins lingual nerve of V3 -> Tongue
What provides Special sensory (taste) of the Post. 1/3 of the tongue?
CN IX - Glossopharyngeal
Sensory fibers exit -> Jugular foramen -> Sup/Inf glossopharyngeal ganglion -> tongue
What branches of nerves lie in the floor of the mouth ?
Lingual nerve (branch of V3)
Chorda tympani and Submandibular Ganglion (of CN VII)
Glossopharyngeal nerve
Hypoglossal nerve
The Lingual nerve branches off of what cranial nerve and provides what function?
Branches off of V3 and provides general sensory for Ant 2/3 of tongue
What salivary glands are located at the floor of the mouth?
Submandibular and Sublingual salivary glands
What provides arterial blood supply to the submandibular gland?
Facial artery - submental artery
What provides arterial blood supply to the sublingual gland?
Lingual artery - sublingual artery
What nerve provides the Parasympathetic function of the Submandibular and sublingual glands?
CN VII - Facial
Sup. Salivatory Nucleus -> int. acoustic meatus -> facial canal -> chorda tympani through middle ear -> petrotympanic fissure -> infratemporal fossa -> joins lingual nerve of V3 -> Synapse at submandibular ganglion -> continue onto submandibular and sublingual glands
What structures run deep to the hyoglossus muscle?
Lingual artery
What structures run superficial to the hyoglossus muscle?
- Hypoglossus nerve
- Lingual nerve
- Submandibular duct
What muscles produce protusion of the tongue?
Genioglossus - middle and inferior fibers
What muscles produce retrusion of the tongue?
Hyoglossus, Styloglossus, and Genioglossus (superior fibers)
What muscles produce depression of the tongue?
Hyoglossus and Genioglossus (middle fibers)
What muscles produce elevation of the tongue?
Palatoglossus and Styloglossus
What muscles shorten the tongue?
Superior and Inferior longitudinal
What muscles narrow the tongue?
Transverse tongue muscles
What muscles flatten the tongue?
Vertical tongue muscles
