Skull Flashcards
what is significant about the fetal skull?
fontanelles - open sutures, allow bb to pass through birth canal
what are the four paranasal sinuses?
frontal
sphenoid
ethmoid
maxillary
what are the 3 bones contributing to the medial wall of the orbit
frontal process of maxilla
lacrimal bone
lateral mass of ethmoid bone
what are the two bones contributing to the roof of the orbit
lesser wing of sphenoid bone
frontal bone
what are the 3 bones contributing to the lateral wall of the orbit
zygomatic process of frontal bone
greater wing of sphenoid bone
orbital surface of zygomatic bone
what bones make up the nasal complex?
nasal bone lacrimal bone inferior nasal concha maxilla horizontal plate of palatine bone sphenoid bone
how is a Le Fort I fracture characterized?
removal of alveolar process of maxilla
loss of upper teeth
how is a Le Fort II fracture characterized?
fx of maxilla at zygomatic-maxillary suture
how is a Le Fort III fracture characterized?
detachment of all upper face bones from cranium
what structure separates the hard palate from anterior nasal spine?
incisive foramen of the maxilla
what structure holds the teeth of the upper jaw
alveolar process of the maxilla
how does the palatine bone contribute to the orbit?
orbital process of the palatine bone forms the medial floor
how does the palatine bone contribute to the nasal cavity?
perpendicular plate forms the lateral wall of the nasal cavity
what bone forms the inferior portion of the nasal septum?
vertical plate of the vomer bone
what structure passes through the lacrimal groove?
nasolacrimal duct
what structures make up the zygomatic arch
zygomatic process of temporal bone
temporal process of zygomatic bone
what foramen do the olfactory nerves pass through?
cribiform foramina
in what bone is the cribiform foramina found
ethmoid bone
what attaches to the crista galli of the ethmoid bone?
falx cerebri
what bone forms the superior and middle nasal concha
ethmoid bone
what feature of the sphenoid bone forms the posterior wall of the orbit?
superior orbital fissure
is the sphenoid bone paired or unpaired?
unpaired but spans across both sides of the skull
what three grooves of the occipital bone form the route of the venous drainage for the brain
groove for sigmoid sinus
groove for transverse sinus
groove for superior sagittal sinus
what two structures articulate when nodding?
occipital condyles and C1
what bone contains the foramen magnum
occipital bone
what is the petrous portion of the temporal bone
a thickening of bone which protects the inner ear
what bones meet at the coronal suture
frontal and both parietal bones
what bones meet at the sagittal suture
both parietal bones
what bones meet at the lambdoid suture
parietal and occipital bones
what bones meet at the squamous suture
temporal and parietal bones
why is it best to leave overlaying tissues on bone flaps of the skull?
the periosteum has little blood supply and takes a long time to heal
what nerve arises from the supraorbital foramen
terminal branch of V1
