Bones Of The Cranium And Orbit Flashcards
Bones meet at ___
Sutures
T/F sutures are immovable junctions
True, except the temporomandibular joint
What are the bones of the cranium?
Frontal, parietal, temporal, occipital, sphenoid, ethmoid
Bones of the face
Frontal, palatine, lacrimal, nasal, inferior conchae, vomer, zygomatic, maxillary, mandible
7 bones of the orbit
Frontal, palatine, lacrimal, zygomatic, maxillary, sphenoid, ethmoid
What does the bony orbit contain?
Globe, connective tissue, EOM, orbital nerves, blood vessels, fat
What are the dimensions of the orbit?
Width 40 mm, height 35 mm, depth 45 mm, volume 3 cc
Bones of the roof of the orbit
Frontal and sphenoid
Bones of the floor of the orbit
Palatine, zygomatic, maxillary
What is the weakest wall in the orbit?
Floor— due to infraorbital canal and maxillary sinus
What bones make up the medial wall?
Ethmoid, maxillary, lacrimal, and sphenoid
What is the thinnest wall in the orbit?
Medial
What is another name for the ethmoid bone?
Lamina papyracea
What sinus is most likely to infect the orbit?
Ethmoid sinus
What bones form the lateral wall?
Zygomatic and greater sphenoid
What is the strongest area in the orbit?
Lateral orbital rim margin
Why does the lateral wall need to be strongest?
Most exposed to possible injury
How many paranasal sinuses are there?
Four
What does each paranasal sinus connect to?
The nose
What is the purpose of the paranasal sinuses?
Reduce the weight of the skull and filter the air we breathe
What are the four paranasal sinuses?
Maxillary, sphenoid, ethmoid, and frontal
Describe the maxillary sinus
Inferior to orbits, largest
Describe the sphenoid sinuses
Posterior and medial to orbits
Describe the ethmoid sinuses
Medial to the orbits
Describe the frontal sinuses
Superior to orbits
