Nasal/ Oral Cavity

Question 1

Nasal Cavities

Answer 1

1. Vestibule: flared portion of nose containing hair follicles
2. Respiratory region: contains conchae
3. Olfactory region: the super aspect containing olfactory epithelium for sense of smell

Question 2

Boundaries of the nasal cavity: lateral wall

Answer 2

Lateral wall: anterior to posterior
Nasal bone (lateral and alar cartilages also)
Maxilla
Lacrimal bone
Ethmoid - superior and middle conchae
Inferior nasal concha - a separate bone
Perpendicular plate (vertical plate) of the palatine bone
Medial pterygoid plate of the sphenoid bone

Question 3

Boundaries of nasal cavity: roof and floor

Answer 3

Roof:  anterior to posterior
Lateral cartilages
Nasal bones
Frontal bone - very small region
Ethmoid bone - cribriform plate (for passage of olfactory nerves)
Sphenoid bone – body

Floor:
Maxilla - palatine process
Palatine bone - horizontal plate

Question 4

Nasal Sinuses

Answer 4

1. Maxillary sinus: w/in body of each maxilla (large space under check)
2. Ethmoidal sinus: w/in each ethmoid bone (anterior, middle, and posterior ethmoidal air cells)
3. Frontal sinus: within frontal bone, bilaterally
4. Sphenoidal sinus: sphenoid bone, septum separates into L/R halves

Question 5

Kiesselbach’s area

Answer 5

located in the anterior part of the nasal septum, where branches of the ophthalmic, maxillary and facial arteries meet

Question 6

Pterygopalatine fossa boundaries

Answer 6

Superiorly by the body of the sphenoid;
Medially by the palatine bone;
Posteriorly by the pterygoid process and greater wing of the sphenoid;
Anteriorly and Inferiorly by the by the maxilla

Question 7

Pterygopalatine fossa conents

Answer 7

Pterygopalatine ganglion and the cell bodies for parasympathetics to oral, nasal, and lacrimal glands

Question 8

Oral cavity boundaries

Answer 8

Superior (roof) - hard and soft palate
Inferior (floor) - mylohyoid muscle
Anterior and lateral - teeth with gingiva and alveolar processes
Posterior - palatoglossal fold (beginning of oropharynx)

Question 9

Greater palatine foramen

Answer 9

posterolateral region of hard palate, transmits greater palatine nerve and artery

Question 10

Lesser palatine foramen

Answer 10

located posterior to the greater palatine foramen; transmits the lesser palatine nerve and artery

Question 11

Incisive canal

Answer 11

midline, located directly posterior to the incisor teeth; transmits nasopalatine n. and terminal branches of the greater palatine artery

Question 12

Blood supply to hard palate

Answer 12

Greater palatine artery (branch of descending palatine artery) - enters through greater palatine foramen and anastomoses with the septal artery after the greater palatine artery passes through the incisive canal.

Question 13

Blood supply to soft palate

Answer 13

1. Lesser palatine artery - enters through lesser palatine foramen.
2. Ascending palatine artery - branch of facial artery.

Question 14

Blood supply to teeth

Answer 14

1. Posterior superior alveolar artery (branch of maxillary) – supplies molars, and anastamoses with branches from infraorbital artery.
2. Middle and Anterior superior alveolar arteries (branches of infraorbital) – middle supplies premolars; anterior supplies canine & incisors; anastamose with posterior superior alveolar artery.

Question 15

Intrinsic muscles of the tongue

Answer 15

Intreated by hypoglossal nerve (CNXII)

To test function of CNXII have person stick out tongue and move around