mandible/TMJ Flashcards
initial appearance(s) of bone tissue in the area where each of the 206 Bone Organs of the body form
ossification centers
2 environments where ossification centers appear
within mesenchyme
on or within a cartilage model
ossification center within mesenchyme called:
intramembranous bone organ development
ossification center within a cartilage model called:
endochondral bone organ development
addition of bone tissue to a bone organ
growth site
growth sites of bone tissue formation
periosteum
endosteum
haversian and volkmann’s canals
PDL
the mandible and maxilla have an _____ bone (organ) ossification center
intramembranous
some bones, such as the ____ bones, have both intramembranous and endochondral ossification centers and are referred to as having _____ ossification centers
temporal; mixed
there is one paired Meckel’s cartilage in each ____ of _____
mandibular process; branchial arch I
each cartilage serves as models for 2 _____
ear ossicles (malleus and incus)
each cartilage serves as the site for the appearance of 2 _____
ligaments (anterior malleolar and sphenomandibular)
Meckel’s cartilages serve as both _____ of ear ossicles and as a ____ of each mandible half
ossification centers; growth site
the mandible develops as 2 bilateral halves that exist throughout the _____ period
interuterine
the mandible becomes 1 of the ____ skull bones when osseous union occurs between the halves at the ______
22; end of the first postnatal year
the mandible begins development in the _____; arises from 2 bilateral ossification centers within _____ tissue, lateral to meckel’s cartilages
6th embryonic week; mesenchymal
the ossification centers arise in the future site of the ____
mental foramina (where inferior alveolar nerve branches into mental and incisive nerves)
from each of the ossification centers, the bone of the mandible halves grows posterior to the site of the future ____ and grows anterior toward the ____ where the 2 halves approach each other
TMJ; midline of the chin
an independent cone-shaped area of cartilage becomes enclosed in the posterior end of the facial bone plate, referred to as _____
condylar cartilage
fate of proximal end of meckel’s cartilages
malleus and incus ossicles (bone)
anterior malleolar ligament
fate of middle area of meckel’s cartilages
sphenomandibular ligament
fate of distal (anterior) end of meckel’s cartilages
temporary anterior lingual plate
growth sites of the mandible halves
the place of union or junction between two or more bones of the skeleton
joints or articulations
permits little or no mobility (fibrous and suture joints)
synarthrosis
examples of synarthrosis
between maxillary bones
between temporal and parietal bones
permits slight mobility (cartilaginous joints)
amphiarthrosis
example of amphiarthrosis
pubis symphysis
permits a variety of movements (synovial joints)
diarthrosis
example of diarthrosis
TMJ
the TMJ is referred to as a _____ joint, referring to its dual compartment structure and function
ginglymoarthrodial
ginglymus = hinging joint ; arthrodial = sliding joint
a joint that binds a tooth to a bone socket
gomphosis joint
the fetal elbow joint has what features of MOST freely movable joints?
one joint cavity
incomplete articular disc
cartilage articular surfaces
2 bones that form the TMJ
squamous portion of the temporal bone condyloid process (condyle) of the mandible
unique features of the TMJ
complete articular disc
2 joint cavities
soft connective tissue articulating surfaces
cavitation of lower joint cavity occurs during the ____ month in utero
third
appositional growth occurs between the _____ surface and the _____
articular connective tissue ; condylar cartilage
over 25 years old, condylar cartilage is replaced by _____
compact bone tissue
a rudimentary (embryonic) substance from which cells, tissues, or organs are formed
blastema
the TMJ blastema is where the following form:
condylar cartilage
articular disc
2 joint cavities
soft tissue articular surfaces
meckel’s cartilages serve as both _____ for ear ossicles and as a ____ of each mandible half
endochondral ossification centers; growth site
the enclosed anterior parts of Meckel’s cartilages serve as:
- temporary lingual plate of the mandible halves
- growth site of the developing mandible halves
structures arising from proximal end (ear end) to distal end (chin area)
incus malleus anterior malleolar ligament sphenomandibular ligament mylohyoid groove lining enclosed anterior lingual part of developing mandible
bone growing posteriorly from the ossification centers: the posterior end of the ____ incorporates an independent piece of ____ that becomes condylar cartilage, another ____ of each mandible half
facial plate; hyaline cartilage; growth site
from the ossification center, the forming mandibular bone passes posterior, ____ to meckel’s cartilage in the shape of a ____, forming the ____ and _____
lateral; trough (U); facial and lingual plates
at ___ in the embryo, the blastema or rudiments of the TMJ and site of condylar cartilage appear
8 weeks
at 8 weeks in the embryo, the _____ is present, but ____ is not evident
articular disc; cavitation
cavitation occurs during the ____ month in utero
third
the ____ of the condyle is a growth site of the mandible
hyaline cartilage
