Chapter 20 (Skull, facial bones, & Paranasal Sinuses) Flashcards
(24 cards)
Where does the skull rest?
On the superior aspect of the vertebral column
How many bones is the skull composed of?
22 bones
How many cranial bones are there?
8 cranial bones
How many facial bones are there?
14 facial bones
What two categories are the cranial bones divided into?
The calvaria & floor
What do the cranial bones do?
The cranial bones form a protective housing for the brain
What do the facial bones do?
The facial bones provide structure, shape, &support for the face & form a protective housing for the upper ends of the respiratory and digestive tracts
What bone is commonly discussed with the skull?
Hyoid bone
What are the 8 cranial bones?
- Frontal (1)
- Occipital (1)
- Parietal (2)
- Ethmoid (1)
- Sphenoid (1)
- Temporal (2)
What bones are included in the calvaria?
Frontal, occipital, parietal
What bones are included in the floor?
Ethmoid, sphenoid, temporal
What are the bones of the cranial vault composed of?
Two plates of compact tissue separated by an inner layer of spongy tissue called diploe
In regards to the cranial vault, which plate is thicker?
The outer plate - also known as table
The bones of the cranium, except for the mandible are joined by what?
Fibrous joints called sutures
What are the name of the sutures that join the cranium?
Coronal, Sagittal, Squamosal, & lamboidal
Where is the coronal suture found?
Between the frontal and parietal bones
Where is the sagittal suture located?
On top of the head between the two parietal bones and just behind the coronal suture lines
What is the name of the junction of the coronal and sagittal sutures
Bregma
Where are the squamosal sutures found?
Between the temporal bones and the parietal bones
Where is the lambdoidal suture found?
Between the occipital bone and the parietal bones
What is the name of the junction of the lambdoidal and sagittal sutures?
Lambda
What is the name of the junction of the parietal bone, squamosal suture, & greater wing of the sphenoid?
Pterion
What is the name of the junction of the occipital bone, parietal bone, & mastoid portion of the temporal bone
Asterion
What is the name of the areas of incomplete ossification in newborn infants?
Fontanels
