RTech 66 Midterm Facial bones
| 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?
| Ethmoid bone|
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?|
| Tripod Fx|
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?
| Maxillae |
"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?
| Maxillary sinuses|
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?
| Mandibular condyle|
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?
| Mylohyoid ridge |
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?
| Symphysis menti|
| 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?
| Coronoid process|
| 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?
| Maxillary sinuses|
Anterior nasal spine
|What is the surface landmark that corresponds to the anterior nasal spine?||Acanthion|
|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?|| Cleft palate |
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
| Orbital openings|
- 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