Cranialskeletal Maturation Flashcards
what are the two divisions of the cranioskeleton
- neurocranium
- viscerocranium
what protects the brain
NC
what supports the soft tissues of the face
VC
cranial vault is part of
membranous NC
cranial base is part of
cart. NC
facial skeleton is part of
memb. VC
intramembranous ossification is with membranous or cartilaginous
MEMBRANOUS
endochondral ossification is with membranous or cartilaginous
cart
what develops in regions of intramem ossif. w/i in memb. VC and aid to grow facial bones
secondary growth cart
do secondary growth cartilages develop before or after intramem oss. starts
AFTER!
T/F:
2º growth cartilages undergo endochondral oss and are hyaline cart
FALSE. they are FIBROCART
mand 2º growth cartilages:
coronoid, angular cart, condylar, symphyseal
maxilla 2º growth cartilages
zygoma, palatal and articular eminence
what develops PRIOR to bone and usually is a precursor that undergoes endo oss. and contributes the specific skull bones
PRIMARY growth cartilages
what type of ossification do primary growth cartilages undergo
endochondral oss –> hyaline cart!
what type of cart is primary growth cart
HYALINE
are primary growth cartilages incorporated into the bone or are they separate
SEPARATE
what are transient and develop AFTER a bone has started intramem oss
SECONDARY growth cartilages
what type of cartilage is seondary growth cart
FIBROcartilage
does the fibrocart in 2º growth cart become incorporated into the bone or stay separate
it becomes incorporated or will degenerated after growth is achieved. it is surrounded by developing bone
where does 2º growth cart develop
in areas of compression and pressure gradients
wha are regions of CT b/w bony articulation
sutures
sutures are the 1º growth sites for
mem VC and NC
cart NC
what are the synCHONDroses sutures
HYALINE cart and endochond oss.
where can we find synCHONDroses
cart NC –> cranial BASE
what are the synDESmoses sutures
FIBROUS CT and intramem oss
where can we find synDESmoses sutures
memb NC and VC and between these two
T/F
sutural growth occurs parallal to the suture
FALSE. PERPENDICULAR!!
T/F
sutural growth ONLY happens as long as the suture is PATENT
true!
what type of joint is synARTHROSES
immoveable!
think ARTHRitis
what type of joint is synOSTOSES
remnant of an OSSIFIED suture
what type of displacement is a growth of a bone moves THE BONE to a new position
1º displacement growth
what type of displacement is a growth of a NEIGHBORING bone moving an ADJACENT bone to a new position
2º displacement growth
1º or 2º displacement growth:
the growth of the maxillary tuberosity against the cranial base displaces the maxilla forward
1º
1º or 2º displacement growth:
the nasomaxillary complex moves down and forward due to the growth of the middle cranial fossa and cranial base
2º
2º growths of the mandible include
condylar
symphyseal
angular
what ways does condylar cart grow
up, back and out
symphyseal cart growth allows for
INCREASE in condylar distance
angular cart growth allows for
INCREASED length in ramus
T/F this is an example of displacement growth
growth of cranial base and condylar cart move mandible down and forward
TRUE
and i think its 2º??
