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Bio52 Quiz2 2nd half of CH3
Terms in this set (99)
What do the horiz plates of palatine bones form?
Posterior portion of hard palate
What do the vert. plates of palatine bones form?
Portion of lateral walls of nasal cavity, and contribute small lip of bone to orbital apex
What two bones do the palatines connect?
Maxilla and sphenoid
Where do the two horizontal plates of palatine ariculate?
The posterior portion of median palatine suture.
Which are the 2 important foramina in the palatine bones?
the greater and lesser palatine foramina.
Where is the greater palatine foramen located?
In the posterolateral region of each of the palatine bones; at apex of max 3rd molar.
Where is the lesser palatine foramen located?
Near the greater palatine foramen
How many bones does the upper jaw consist of?
2 max bones fused together at intermaxillary suture.
What bone/s does the maxilla not articulate with?
What does each maxilla consist of?
a body and four processes; frontal, zygomatic, palatine, and alveolar
What surfaces does the body of the maxilla have?
orbital, nasal, infratemporal, and facial
What do the bodies of the maxilla contain?
air-filled spaces or paranasal sinuses (maxillary sinuses
What does the frontal process of maxilla articulate with and form?
articulates with frontal bone and forms medial orbital rim w/lacrimal bone on its anterior surface
What does the inferior orbital fissure separate?
maxilla's orbital surface from the sphenoid bone
What is the infraorbital sulcus?
a groove on the floor of the maxilla's orbital surface
What does the infraorbital sulcus turn into?
the infraorbital canal, then terminates on facial surface of max as infraorbital foramen
Where is the infraorbital foramen located?
approx. 2cm inferior to midpoint of lower magin of orbit. (supraorbital notch superior to it)
Where is the canine fossa located?
Inferior to infraorbital foramen.
What is canine fossa?
elongated depression; posterosuperior to max canine teeth
What is each tooth of the maxilla covered by?
prominent ridge of bone; portion of alveolar process of max
The facial ridge over max canine
Which is more dense mandible or max?
What does the zygomatic process of the maxilla articulate with and what does it help form?
articulates w/zygomatic bone laterally; forms part of infraorbital rim
What 2 max processes help form the infraorbital rim?
frontal and zygomatic processes of maxilla
What do the palatine bones articulate with?
each other; form anterior (major) portion of hard palate.
What is the name of the suture between palatine processes of max?
median palatine suture (on anterior portion)
Median palatine suture covered by......?
median palatine raphe (midline fibrous band of tissue)
where is the incisive foramen?
anterior midline portion of palatine process, posterior to maxillary central incisors
What is the soft tissue that bulges over incisive foramen called?
What does the alveolar process of maxilla and mand. contain?
roots of max. and mand. teeth.
Alveolar process of max can become _____ in pt who is completely_____in max arch. What can this cause?
resorbed; edentulous; infection in max sinuses (resorption occurs to a lesser extent in partially edentulous cases)
What determines the route that dental infect. takes in max bone?
the density of the max
What is max tuberosity and where is it located?
rounded, roughened portion of body of max posterior to most dist. molar on max.
What perforates the superolateral portion of max tuberosity?
1 or more posterior superior alveolar foramina
lower jaw; single facial bone; only freely movable bone; largest/strongest facial bone
What movable articulation does the mandible have?
temporal bone articulation at each TMJ
bony prominence of chin; more pronounced in males
on midline surface of mand; faint ridge; where bone fused by fibrocartilage in early childhood
opening on mand between apices of 1st & 2nd mand premolars; during growth proceeds from ant. to posterosuperior
which is the heavy horizontal portion of the mandible?
which is the vertical portion of the mand?
Where do the mand's. body and ramus meet?
at the angle
What provides space for addt'l teeth as child aproaches adulthood?
body and alveolar process of mandible
Alveolar process of mand can become ______if pt becomes completely or paritally_______in mand arch? What can happen?
resorbed; edentulous; mental foramen travels to superior border of mand (changing its position).
What part of mandible is less dense than body of mand. and even less dense than alveolar process of post. teeth?
alveolar process of mand incisors
What determines the easiest and most convenient areas of bony fracture used during tooth extraction?
the differences in alveolar process density
Which tooth is easier to remove by fracturing the thin lingual surface?
mand 3rd molar
stout, flat plate; grows superiorly and anteriorly displacing mental prtuberance of chin inferiorly and ant. as one nears adulthood.
thin, sharp margin on ant. border of ramus
Concave forward curve which is main portion of ant. border of ramus......?
Inferior to coronoid notch on ant. border of ramus.......?
external oblique line; crest where ramus joins body of mandible; radiopaque on xray superior to mylohyoid line; used to locate coronoid notch.
Where does the thickened posterior border of the ramus extend from?
angle of the mandible to condyle of the mandible with it's neck.
Articulating surface of the mandible?
oval head; involved in TMJ.
depression between coronoid process and condyle.
near midline of mand. cluster of small projections/mental spines.
rounded roughened area at mand alveolar process; post to most distal molar of mand.; when covered with tissue is retromolar pad.
along medial surface of body of mand; aka internal oblique line; more prominent as it ascends
shallow depression; contains sublingual salivary gland
deeper depression; contains submandibular salivary gland.
on internal surface of ramus; central opening; 3/4 the distance fr coronoid notch to post border of ramus
what is the opening to the mandibular canal?
What happens sometimes with excessive alveolar process absorption?
mand canal disappears entirely
bony spine overhanging mandibular foramen; attachment for sphenomandibular ligament assoc. w/ TMJ
small groove; passes forward/downward from mand foramen
articulating surface of condyle?
where mand articulates w/ temporal bone at TMJ
triangular depression on condyle
Where do the sublingual and submandibular glands empty into?
What are the paranasal sinuses?
Paired, air-filled cavities, filled w/mucous membranes
How many paranasal sinuses?
4; ethmoidal, frontal, sphenoidal, maxillary
How do paranasal sinuses communicate with nasal cavity?
through small ostia in lateral nasal wall
What three things do sinuses do?
1. act as sound resonators 2. lighten skull 3.provide mucous for nasal cavity
inflamed mucous membranes of sinuses
assymetrical; separated by sepetum
on body of sphenoid; cannot be palpated; assymetrical
How do the sphenoidal sinuses communicate with and drain into nasal cavity?
through opening superior to each superior nasal concha
small cavities in each of ethmoid bones; divided into anterior, middle, posterior air cells.
Where do the posterior ethmoid air cells open into? Middle and anterior ethmoid air cells?
superior meatus of nasal cavity; middle meatus
in body of maxilla; size varies according to age; pyramid shaped; largest; each has apex, 3walls, a roof, and a floor.
what does the apex of the pyramid of the maxillary sinus point towards?
how many fossae are present in external surface of skull?
3; temporal, infratemporal, and pterygopalatine
flat, fan-shaped paired depression, lateral surf. of skull
Which bones form the temporal fossa?
zygomatic, frontal greater wing of sphenoid, temporal, parietal
What do a narrow strip of parietal bone, squamous portion of temporal bone, temporal surface of frontal bone, and temporal surf. of greater wing of sphenoid have in common?
They're included in the temporal fossa.
Where is the body of the temporalis muscle located?
paired depression, inferior to anterior portion of temporal fossa
what divides the temporal fossa and infratermporal fossa?
the infratemporal crest on greater wing of sphenoid
how do structures pass from infratemporal fossa into orbit?
through the inferior orbital fissure; located at anterior and super. end of fossa
cone-shaped, paired depression deep to infratemporal fossa, between pterygoid process and maxillary tuberosity; close to orbit apex
what landmarks of the palatine bones does the pterygopalatine fossa connect wth?
greater and lesser palatine foramina
forms base of tongue/larynx; super./ant. to thyroid cartilage of larynx; at 3rd cervical vertebra
where can hyoid be palpated?
inferior to &medial to angles of mand.
hyoid bone articulates with other bones. T/F
what does the hyoid help in?
mastication, swallowing, speech
where is this bone suspended from?
end of styloid process by stylohyoid ligament and broad thyrohyoid membrane w/thyroid cartilage
What shape is the hyoid bone and what anterior portions does it consist of?
u-shaped. 5 portions; body(midline), 2greater/2lesser cornu(pair of projections on each side)
Which foramina are openings of pterygopalatine canal?
greater and lesser palatine foramen
Location Temporal fossa?
lateral surface of skull
Location Infratemporal fossa?
inferior to anterior portion of temporal fossa.
Location pterygopalatine fossa?
deep to infratemporal fossa, between pterygoid process and maxillary tuberosity, close to orbital apex
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