Histo - Rougier Flashcards
above the notochord is related to the
brain
below the notochord is related to the
arches aka viscerocranium
the viscerocranium is derived from
NCCs (ectomesenchyme)
intramembranous means it never had
cartilage
endochondral bone means it had _______ that gave shape to ______
cartilage ; bone
had cartilage, it dies, gets replaced by bone
primary endocondral
cartilage that originates from intramembranous bone
secondary endochondral
cartilaginous neurocranium forms the
base of skull
membranous neurocranium forms the
roof of skull
arch 1 - distal Meckel’s cartilage gives rise to
malleus
arch 1 - dorsal Meckel’s cartilage gives rise to
incus
stapes is from arch
2
reichert’s cartilage in arch 2 gives rise to the
origin of hyoid
membranous viscerocranium (4 things)
maxilla
zygomatic
squama of temporal
mandible
origin and ossification of frontal bone
NCC and IM
origin and ossification of parietal bone
Mesodermal and IM
origin and ossification of occipital bone
mesoderm and endochondral
origin and ossification of petrous temporal bone
mesoderm and endocondral
origin and ossification of squamous temporal bone
NCC and endochondral
origin and ossification of hyoid bone
NCC and endochondral
the body of the mandible develops by what bone formation
intramembranous
is there an equivalent of meckel’s cartilage in the maxilla
no
articular cartilage develops from what cartilage
secondary
intramembranous bone formation forms most of the _________ , except the __________
mandible ; condylar process
the neurocranium grows ____ and ______
up and back
the maxilla is displaced _______ and _______
anteriorly (to the right) and down
expansion of the facial skeleton accompanies growth of the brain and soft tissues - this is called
bone drift
the maxillary tuberosity grows ________ and _______ to accommodate new teeth
down (posteriorly)
to the right (inferiorly)
there is no _______ covering the articular surfaces in the skull
epithelium
small opening of jaw
rotation
large opening of jaw
translocation (pushing forward)
dorsal portion of articular eminence is in-between the
disc and skull
the ventral portion of the articular eminence is between the
disc and condyle
TMJ is formed most by __________ which is rich in ___________
fibrous CT ; collagen 1
there is no ________ present on any of the surfaces of the TMJ
epithelium
what makes up parts of the TMJ (4 parts)
articular eminence
articular fossa
articular disc
condylar process
what are the 4 stages of the condylar process formation
proliferation
hypertrophy
calcification
ossification
since the end product of the condylar/articular process is ossification, eventually we will only have a thin layer of _________ in the condylar process and a thick layer of ______________
fibrocartilage ; dense & fibrous CT
the alveolar process is derived from
NCCs
the neural portion = the body of the jaw will
stay no matter what
the formation of the alveolar process occurs as the body of the mandible forms which is seen as
vertical growth of bone during bell stage
development of the alveolar process accompanies
deciduous and permanent tooth
eruption
3 components of the alveolar process
alveolar bone proper (ABP)
cortical bone plate (CP)
spongiosum (trabecular) bone
the alveolar bone proper lines the ______ and has direct contact with the _______
alveolus ; roots
the cortical bone plate forms ______ and ______ surfaces
lingual and facial
the spongiousm bone connects
ABP and CP
alveolar bone proper is identified as what in radiographs
lamina dura
alveolar bone proper is composed of _______ bone and _______ bone
bundle and compact
bundle bone is much richer in organic content so it does not show
osteon organization
what is the deeper portion of the alveolar bone
compact bone
bundle bone has an abundance of __________ fibers which are abundant in what type of collagen
Sharpey’s fibers ; type 1
supporting alveolar bone is composed of the
cortical plate and spongiosum
which teeth have little presence of spongiosum
anterior
the alveolar process adapts during growth to achieve proper
occlusion
facial translocation of teeth occurs in association with
enlargement of the face
tension on bone =
deposit bone
pressure on bone =
resorb bone
tension and pressure on bone is the effect of
mesial drift
signs of mesial drift: compress side =
resorption
signs of mesial drift: tension side =
deposition
simultaneous deposition of bone by osteoblast and remodeling by osteoclast is called
coupling
osteoblasts produce
Howship’s lacuna
the direction of drift follows the side with
deposition (appears smooth)
what gives the curvy shape in drift images
Howship’s Lacuna
no teeth = no
alveolar bone
alveolus that is too thin
fenestration
