43 Questions
Which suture is NOT parallel to the others?
Frontozygomatic suture
What is the direction of growth at the zygomatico-maxillary suture?
From upward anteriorly to downward posteriorly
Which of the following contributes to the height of the maxilla?
Alveolar process development
What is the process called when the maxillary sinus expands?
Pneumatization
What occurs at the floor of the nasal cavity during maxillary growth?
Bone resorption
What is the result of bone deposition on the oral surface of the palate?
Increase in the height of the maxilla
What is the main function of the mandible?
Reception of the lower teeth
What is the shape of the body of the mandible?
Curved and horizontal
When does the palato-facial center of ossification for the premaxilla appear?
At the end of 6 week intrauterine
What is the name of the second center of ossification for the premaxilla?
Prevomerine center
At what stage of development does the maxilla articulate with the other bones of the skull by 4 main sutures?
At birth
What is the main location of the prevomerine center of ossification?
Along the outer alveolar wall
When does the union between the maxilla and premaxilla occur?
At 8 weeks of intrauterine life
What is the name of the suture that the maxilla articulates with?
Franto-maxillary suture
What is the type of growth that continues till 10 years of age?
Sutural growth
Where do small areas of secondary cartilaginous centers appear?
Along the growing margin of the alveolar plate
What is the pathway through which the ossification spreads in the backward direction?
Through the mesenchyme of the first branchial arch
What marks the point of divergence of the ramus of the mandible from Meckel's cartilage?
The mandibular foramen
What is the shape of the cartilage that appears in the region of the condyle?
Carrot-shaped
What forms the posterior half of the ramus to the level of the inferior dental foramen?
The condylar cartilage
When does the alveolar process start forming?
When the deciduous tooth germs reach the early bell stage
What is the result of the growth of the bone of the mandible on each side of the tooth germ?
The tooth germs come to be in a groove of bone
What is the transient growth cartilage center that gives rise to the coronoid process?
The coronoid cartilage
What is the pathway through which the inferior dental nerve lies?
Through the trough of bone
What separates the mandibular canal from the bony crypts?
A horizontal plate of bone
How does the growth of the mandible occur?
Mainly by secondary cartilages
What is the result of the growth of the mandible by secondary cartilages?
Increase in the overall length of the mandible
At birth, what is the shape of the angle of the mandible?
Obtuse
What is the size of the mental foramen at birth relative to the socket of the first deciduous molar tooth?
Beneath the socket
What is the characteristic of the coronoid process at birth?
Large size
What is the direction of the condyloid portion at birth relative to the body of the mandible?
Nearly in line with the body
What is the stage of growth during which the alveolar processes grow rapidly?
Tooth eruption
At what age does the two segments of the mandible become joined at the symphysis?
During childhood
What is the approximate angle of the mandible at birth?
175 degrees
What happens to the alveolar process in old age?
It is absorbed
What is the position of the mental foramen in adulthood?
Midway between the upper and lower borders of the bone
What is the direction of the ramus in adulthood?
Almost vertical
What is the approximate angle of the mandible in adulthood?
110-120 degrees
What happens to the mandibular canal in adulthood?
It runs nearly parallel with the mylohyoid line
What is the main change that occurs in the body of the mandible during childhood?
It becomes elongated in its whole length
What is the result of the growth of the alveolar part in childhood?
The depth of the body increases
What is the approximate angle of the mandible in childhood?
140 degrees
What happens to the sub-dental portion of the mandible in childhood?
It becomes thicker
Test your knowledge of the premaxilla bone formation, including the palato-facial center and prevomerine center. Learn about the process of ossification and its significance in embryonic development.
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