Oral Cavity Flashcards
(34 cards)
What is the innervation of of these muscles found in the floor of the mouth?
The mylohyoid (n. to the mylohyoid); geniohyoid (C1 via XII).
Where is the location of duct openings for all three salivary glands?
Parotid: external to the 2nd upper molar;
Submandibular: submandibular papilla on floor of mouth;
Sublingual: 15-20 openings along sublingual fold on lateral aspects of base of tongue.
List the four types of lingual papilla.
Filiform, fungiform, foliate, aand circumvallate.
Which lingual papillae exhibit taste buds?
The circumvallate and fungiform papillae.
Which lingual papillae may keratinize?
The filiform and fungiform (slight) papillae.
What does the foramen cecum represent?
The site of invagination of epithelium that formed the thyroid gland.
Where is the foramen cecum found?
It is located at the apex of the sulcus terminalis on dorsum of the tongue.
What is the thyroglossal duct?
The pathway of descent for the thyroid duct into the neck from the foramen cecum.
To what four things is the tongue anchored?
Styloid process, hyoid bone, mandible, pharynx
List the muscles of the floor of the mouth from superficial to deep.
The mylohyoid and the geniohyoid mm.
Lymphatic drainage of tongue
Tip: submental nodes
Anterior 2/3: submandibular and deep cervical
Posterior 2/3: deep cervical
List the extrinsic muscles of the tongue and their innervation and function
1) genioglossus: protrude tongue, depress medial region
2) hyoglossus: depressor and retractor of tongue
3) styloglossus: retract tongue
4) palatoglossus: constricts orophayngeal isthmus, elevates root of tongue
all innervated by XII except the palatoglossus which is XI via X (pharyngeal plexus).
What nerve supplies sensation and taste to the epiglottis?
Vagus
What supplies sensory innervation to the palate? motor??
greater and lesser palatine nn (V2) sensory
Motor: XI via X… Except tensor palati (V3)
What is the bony composition of the hard palate?
The anterior 2/3 = maxilla, the posterior 1/3 = palatine.
Which muscles comprise the soft palate?
The palatoglossus, palatopharyngeus, musculus uvulus, levator palati, and tensor palati.
Into what do the muscles of the soft palate insert?
The palatine aponeurosis.
What is the action/innervation of each of the muscles of the soft palate?
The palatoglossus: pulls lateral aspects of tongue up;
Palatopharyngeus: adducts posterior pillars and pulls pharynx up;
Musculus uvulus: elevates and contracts uvula;
Levator palati: KEY mover of soft palate - elevates;
Tensor palati: tenses palate.
ALL innervated by XI via X (pharyngeal plexus) except tensor palati (V3).
What are the 3 divisions of the pharynx and the communications (things that open into) in each region?
Nasopharynx (posterior choanae of nasal cavity);
Oropharynx (oral cavity through the posterior arch);
Laryngopharynx (larynx).
What is the innervation and function of the pharyngeal constrictors?
The pharyngeal constrictors constrict the pharynx and force contents downward. They are innervated by XI via X (pharyngeal plexus).
What muscle separates superior and middle constrictor? Innervation?
Stylopharyngeus m, CN IX
How is the nasal septum constructed?
By the perpendicular plate of ethmoid, vomer, and septal cartilage.
Be able to label a diagram of the lateral wall of the nasal cavity that illustrates the various meatuses and the non-sinus structures that open into each.
This is important (top of page 380). It is generally asked in matching question: inferior meatus: nasolacrimal duct; middle meatus: frontal sinus, maxillary sinus, ant & middle ethmoidal air cells; superior meatus: posterior ethmoidal air cells; sphenoethmoidal recess: sphenoidal sinus.
List the four paranasal air sinuses and their specific site of drainage into the nasal cavity (meatuses).
Frontal sinus: hiatus semilunaris of middle meatus;
Maxillary sinus: hiatus semilunaris of middle meatus;
Ethmoidal air cells (anterior) hiatus semilunaris; (middle) bulla ethmoidalis of middle meatus; (posterior) superior meatus;
Sphenoid sinus: sphenoethmoidal recess.
