How many facial bones are there?
How many paired bones?
How many individual bones?
14 facial bones
6 paired - nasal, lacrimal, maxilla, zygoma, I.N.C,
2 individuals - Mandible & Vomer
What are the smallest and thinnest bones?
Where are the lacrimal bones found?
Whats the opening on the (bottom inferior portion) edial wall of orbit?
Nasal & Lacrimal bones
In the orbits
lacrimal duct / tear duct
What is attached to the medial walls of the maxilla &
extend into the nasal cavity?
Inferior nasal conchae
*they are by themselves**
Where are the superior & middle nasal conchae located?
What is the purpose for the inferior nasal conchae?
What forms the bony hard palate?
Warm, cleanse & moisten inhaled air
Palatine process of maxilla & horizontal plate palatine bone
Where are the palatine bones seen?
What are the 2 portions of the palatine bone?
In posterior hard palate (roof of mouth) & dot in the orbits
horizontal plate & Perp/vertical plate
FYI: Horizontal portion of the palatine forms the posterior
portion of the bony hard palate.
Perp/vertical plate is seen in orbits
What are the 2 names for the Zygoma?
What are the zygoma processes?
Malar & Prominence of cheek
What type of fx occurs in the zygoma?
The zygoma separates from the 3 process and is free floating
What part of the orbit does the zygoma form?
Lateral orbital walls (Also forms part of the floor of the orbit)
What are the 2 largest immovable facial bones?
What is its aka name?
"anchor of face"
The maxillary bones articulates with all facial bones except?
What are the 4 processes of the maxillae?
Frontal - Zygoma - Palatine - Alveolar= processes of maxillae
What is found in the body of the maxillae?
The roof of the maxillae forms what?
Floor of orbits
Why is the roof of the maxillary bone so thin?
So when the eye ball is compressed due to trauma, the eye ball can fall into the maxillary sinuses.
What forms the Zygomatic arch?
What shape is the vomer?
Zygomatic Process of the temporal bone & Temporal process of the Zygomatic bone
Plow shape - Triangular
Why does the vomer go back into the head?
What forms the bony nasal septum?
Protect vomer from breaking.
Vomer & perp plate of ethmoid bone
What happens when the vomer & perp plate of ethmoid
Separates from each other?
Deviated bony nasal septum
What type of joint is the TMJ?
What forms the TMJ?
Mandibular condyle & mandibular fossa of temporal bone
What is the name of the head of the mandible?
What does the mandibular condyle fit into?
Where is the mandibular fossa found?
On the temporal bone
Whats the purpose for the bumps inside the mandible on the mentum?
What is the name of these bumps?
Holds the frenulum
What hole is on the inside of the mandibular rami?
What hole is on the body of mandible?
Mandibular foramen (inside of rami)
Mental foramen (on mentum)
What is the ridge of bone that runs down the canal?
What is the s-shaped projection of bone at the ending of the ridge that protects the mylohyoid vessels & nerves?
Lingula of mandible (There is also a sphenoidal lingual)
What's the name of the suture that fuses in 1 yr olds?
What is the projection right below the symphsis menti?
What is the center of the mental protuberance?
From lateral body to mid lateral body is called?
What is the U-shape on the mandible?
The mandibular notch is anterior to what?
The mandibular notch is posterior to what?
What process fits under the Zygomatic notch?
Nasal bones meet the frontal bone. What is this point?
Fissure is located at the nasion unless what?
Deviated nasal septum
Lacrimal bones form what part of orbits?
Medial border of orbits next to frontal process of maxillae
What facial bones form the 3 facial cavities?
What are the 3 cavities the maxilla forms?
Later wall of nose, floor & medial wall of orbits & roof of mouth
Nose, roof of mouth, orbits
What is the most important cavity?
Orbits. Because of the damage that could be done to the eye.
What are the 2 cavities located inside the maxillary?
The 2 maxillary bones meet at the alveolar ridge and form a bony projection called?
Anterior nasal spine
What is the surface landmark that corresponds to the anterior nasal spine?
Where does the "blow out" fracture occur?
Maxillary (The floor of the orbit; the floor is displaced inferiorly; can be seen in Modified Waters for facial bones or exaggerated Caldwell (30) for orbits)
Contents of eye is pushed back into the apex of the cone shaped orbital canal.
What is it called when the suture joining the right and left palatine process of maxillae does not close near the alveolar ridge?
It leaves a hole in the roof of the mouth & up into the lip
What is another name for the inferior nasal conchae?
Turbinates. They come off lateral wall of nasal bone
What are the 4 openings in the orbits?
Superior orbital fissure
Inferior orbital fissure
Apex back of head
base formed by SOM/LOM/IOM/ & MOM
Roof = frontal
Medial wall = ethmoid & lacrimal
Lateral = zygoma & sphenoid
Floor = maxillae (zygoma)
**Know pic of orbit** know them
3 cranial frontal ethmoid sphenoid
Max pala lacrimal
Orbital angles **know these angles**
Long axis is directed from lateral to medial at a 37 degree angle with msp (from base to apex)
- Optic canal forms a 30 degree upward angle with oml
- Superior orbital fissure made by lesser & greater wings of sphenoid
Inferior orbital fissure made by the sphenoid & max bone & zygoma at anterior region
Optic foramen is the passage opening into the apex of the orbit for the optic nerve & ophthalmic artery
Sphenoid strut holds nerves & arteries.
Lat, Pa Axillary - Caldwell
Parietocanthial or Acanthoparietal ( waters, rev waters)
8x10 LW in bucky
8x10 LW 0 degrees IPL perp to IR CR per to IR
Lateral Ioml .. bottom edge per to top e
Cr prominence of cheek
Ipl per to IR
IOML // transcerse axis & per to front edge
Check for tilt orbital plates
rotation condyles of mandible
Smallest bone in orbit - palatine bone
Outercanthus of upside orbit - what is entrance
what attaches to the frenulum - genial tubercles
what fits under the zygo arch coronoid process