Development of Vomer Bone

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Questions and Answers

What is the process that aids in the enlargement of the nasal cavity and increases the height of the maxilla?

Sutural growth

Ossification

Pneumatization (correct)

Bone resorption

What is the purpose of Meckel's cartilages in the development of the mandible?

Supporting the lower teeth

Guiding the growth of the mandible

Formation of the alveolar process

Ossification of the mandibular arch (correct)

Where does the mandibular nerve divide into the lingual and inferior alveolar nerve?

At the mental foramen

At the incisive foramen

At the junction between proximal and middle third (correct)

At the junction between middle and distal third

What is the function of the alveolar process?

Reception of the lower teeth Signup and view all the answers

What is the result of bone resorption at the floor of the nasal cavity?

Enlargement of the nasal cavity Signup and view all the answers

What is the purpose of bone deposition on the oral surface of the palate?

Enlargement of the maxilla Signup and view all the answers

At which week of intrauterine life does the prevomerine center begin to form?

8-9 weeks Signup and view all the answers

What is the function of the prevomerine center?

Forms the part of the bone which lies mesial to the nasal paraseptal cartilage Signup and view all the answers

What type of growth continues till 10 years of age?

Sutural growth Signup and view all the answers

What is the direction of the sutures that the maxilla articulates with other bones of the skull?

From upward anteriorly to downward posteriorly Signup and view all the answers

What is the role of the accessory cartilaginous center?

Undergoes rapid ossification in the region of the future zygomatic process Signup and view all the answers

What adds to the height of the maxilla?

Alveolar process development Signup and view all the answers

What is the main factor for the growth of the maxilla?

Subperiosteal bone formation Signup and view all the answers

How does the maxillary sinus expand?

By bone resorption on the sinus side and bone deposition on the facial surface Signup and view all the answers

What type of ossification occurs in the maxilla proper?

Intramembranous ossification Signup and view all the answers

Which of the following is NOT a direction of ossification in the maxilla proper?

Lateral Signup and view all the answers

How many centers of ossification are present in the premaxilla?

Two Signup and view all the answers

What is the name of the bony trough that carries the infraorbital nerve?

Infraorbital canal Signup and view all the answers

What is the name of the process that forms the outer alveolar plate for the maxillary tooth germs?

Downward extension Signup and view all the answers

What is the location of the first center of ossification in the maxilla proper?

Below the eye bulge Signup and view all the answers

What is the name of the part of the premaxilla that forms the inner wall of the alveoli?

Palatal process Signup and view all the answers

At what week of intrauterine development does the palato-facial center of the premaxilla appear?

6 weeks Signup and view all the answers

Study Notes

Development of the Maxilla

Begins at around 8-9 weeks of intrauterine life along the outer alveolar wall
Situated beneath the anterior part of the vomer bone, forming the part that lies mesial to the nasal paraseptal cartilage
Union between the maxilla and premaxilla occurs at 8 weeks of intrauterine life

Accessory Cartilages

Appears in the region of the future zygomatic process and undergoes rapid ossification
Small areas of secondary cartilaginous centers appear along the growing margin of the alveolar plate
Appears in the midline of the developing hard palate between the two palatine processes

Growth of the Maxilla

Sutural growth: continues till 10 years of age, then becomes less significant
Maxilla articulates with other bones of the skull by 4 main sutures: fronto-maxillary, zygomatico-maxillary, zygomaticotemporal, and pterygopalatine sutures
All these sutures are parallel to each other, directed from upward anteriorly to downward posteriorly
Growth at these sutures will shift the maxilla forward and downward

Alveolar Process Development

Adds to the height of the maxilla
Eruption of teeth, especially the permanent set, serves to add to the length of the arch
Eruption of the upper permanent molars adds to the length of the arch

Subperiosteal Bone Formation

Occurs throughout life
Serves as a main factor for the growth of the maxilla

Enlargement of the Maxillary Sinus

Plays an important role in the growth of the body of the maxilla
Expands by bone resorption on the sinus side and bone deposition on the facial surface of the maxillary process (pneumatization)

Bone Resorption and Bone Deposition

Occurs also in other sites than the sinus
Bone resorption at the floor of the nasal cavity
Bone deposition on the oral surface of the palate
Aids in the enlargement of the nasal cavity and increase the height of the maxilla

Development of the Mandible

Is the largest and strongest bone of the face
Serves for the reception of the lower teeth
Consists of a curved, horizontal portion (body), and two perpendicular portions (rami), unite with the ends of the body nearly at right angles

Body of the Mandible

Ossified in the fibrous membrane covering the outer surfaces of Meckel's cartilages
Two in number, a right and a left
Meckel's cartilage has a close relationship to the mandibular nerve at the junction between proximal and middle third