Ch 11 Skull General Flashcards
What are the 8 cranial bones?
1 frontal (skullcap)
2 parietal (skullcap)
1 occipital (skullcap)
2 temporal (floor)
1 sphenoid (floor)
1 ethmoid (floor)
What are the 14 facial bones?
2 maxillae (upper jaw)
2 zygomatic bones
2 lacrimal
2 nasal bones
2 inferior nasal conchae
2 palatines
1 vomer
1 mandible
What is the slight depression above each eyebrow?
supraorbital groove (SOG)
What 4 bones does the frontal bone articulate with?
left & right parietal
sphenoid bone
ethmoid bone
Where is the inion located?
Inferior portion of the occipital bone
What is the widest portion of the entire skull is located between the:
parietal tubercles
What does the parietal bone articulate with? (5)
frontal bone
occipital bone
temporal bone
sphenoid bone
opposite parietal bone
The two lateral _____ ______ are oval processes, with convex surfaces located on each side of the magnum
condylar portions
(occipital condyles)
What is the large opening at the base of the skull called?
What does is do?
foramen magnum
where the spinal cord enters the brain
The occipital bone articulates with? (6)
2 parietals
2 temporals
1 sphenoid
1 atlas
What are the three primary portions of the temporal bone?
Squamous
mastoid (posterior to EAM)
petrous
What bone is referred to as the anchor for the seven cranial bones?
sphenoid bone
The articulation between the skull and the cervical spine is called the?
atlanto-occipital joint
What is the densest portion of the temporal bone that shows up on x-rays?
what is the upper portion of this called?
petrous portion
petrous ridge
What is the name of the posterior portion of the sella turcica?
dorsum sellae
What bone protects the pituitary gland?
sella turcica
What is the most vulnerable portion of the skull?
Squamous portion
How many bones does the temporal bone articulate with? (3)
parietal
occipital
sphenoid
What is located posterior to the sella turcica?
Dorsum sellae
What projection best shows the sella turcica and dorsum sellae?
lateral projection
The ethmoid bone is located _____ to the sphenoid bone
anterior
How many sinuses are there?
frontal sinus
maxillary sinus
(body of) sphenoid sinus
ethmoid sinus
What kind of joints are the adult cranial sutures?
immovable
synarthrodial
fibrous
What is the anterior suture?
What cranial bones does it separate?
coronal suture
separates frontal bone & two parietals
what is the posterior suture?
What does it separate?
lambdoidal suture
separates both parietal bones from the occipital bone
What are the lateral sutures?
squamosal suture
How many junctions within the skull?
6 total
1 bregma
1 lambda
2 pterion (R & L)
2 asterion (R & L)
What is the anterior junction of the sagittal suture?
Bregma (junction)
What is the posterior junction?
lambda junction
What are the lateral junctions?
What cranial bones do they connect?
pterion junction
frontal, parietal, temporals, and greater wing of the sphenoid
What are the lateral posterior junctions?
What does it connect?
asterion junction (posterior to ear)
where squamosal & lambdoidal sutures meet
What is the equivalent anatomy (junction) for an infant to an adult skull:
Anterior Fontanel:
posterior Fontanel:
right sphenoid fontanel:
left sphenoid fontanel:
right mastoid fontanel:
left mastoid fontanel:
Bregma
lambda
right pterion
left pterion
right asterion
left asterion
Which fontanel is the largest and closes at what age?
anterior fontanel (bregma)
18 months of age
Small and irregular bones that can develop in adult sutures are called?
sutural or Wormian bones
Registry question:
Can you see the sinuses in a water or caldwell projection?
no
only in open mouth waters
3 bones that make up the orbital:
zygmoa
frontal
