primary sites which are responsible for the mandibular growth ?

bharat

9) The primary sites which are responsible for the mandibular growth is/are
a) condyles alone
b) condyles and posterior border of ramus
c)alveolar crest and condyles
d)alveolar crest and posterior border of ramus of mandible
e)none of the above is correct

bharat

Quote:

Originally Posted by bharat

9) The primary sites which are responsible for the mandibular growth is/are
a) condyles alone
b) condyles and posterior border of ramus
c)alveolar crest and condyles
d)alveolar crest and posterior border of ramus of mandible
e)none of the above is correct

well no body replyed this till now so i will give you some clue my 2 question one here next in "utero bilateral..........." have common option so try one if you are correct in one you will get next as free haha

goodluck

Oak

Before answering this question lets talk a little bit about the mednibular development in the fetus and then in the postnatal life.

When the embryo is 4-5 week old the pharyngeal arch is developed. The first pharyngeal arch give rise to maxillary process from a dorsal portion and mandibular process (Medkel’s cartilage) from the ventral portion.
The mandible is formed secondarily by intramembranous ossification of the mesodermal tissue surrounding Meckel’s cartile.

During the first years of life, the size and proportions of the facial skeleton change markedly. The facial skeleton increases in relation to the rest of the head, and the sinuses and dentition develop postnatally. The mandible is relatively small at birth and grows by remodeling. The eruption of teeth and the development of the alveolar process also contribute to vertical growth. Apposition of bone at other surfaces causes the bone to develop a more adult shape. Thus, the mandible assumes a more forward position and a longer shape. The condylar growth centers are crucial in mandibular development. Each center consists of chondrogenic, cartilaginous, and osseous zones. A thin vascular layer covers the chondrogenic zone. Bone is deposited at the posterior borders of the rami and condyles.

Lets come to the point if the growth is concerned about the ossification center I would go for “a” as condyle has the growth center which consist of chondrogeni, catilagious and osseous zones but bone is also deposited along the posterior borders of the rami and condyles which shape the mandible then in terms of this “b” is also correct.

And your question is “The primary sites which are responsible for the mandibular growth is/are” according to your question “c” is the suitable answer. As ramus do not plays a significant role although bones get deposted at its posterior borders but another important thing is development of the alveolar process contributes to vertical growth of the mandible.

So, Condyle and Alveolar process would be my choice at it seems that your question demands two options if it was “The primary sites which is responsible for the mandibular growth is” then my choice would have been “a”.

bharat

Quote:

Originally Posted by Oak

Before answering this question lets talk a little bit about the mednibular development in the fetus and then in the postnatal life.

When the embryo is 4-5 week old the pharyngeal arch is developed. The first pharyngeal arch give rise to maxillary process from a dorsal portion and mandibular process (Medkel’s cartilage) from the ventral portion.
The mandible is formed secondarily by intramembranous ossification of the mesodermal tissue surrounding Meckel’s cartile.

During the first years of life, the size and proportions of the facial skeleton change markedly. The facial skeleton increases in relation to the rest of the head, and the sinuses and dentition develop postnatally. The mandible is relatively small at birth and grows by remodeling. The eruption of teeth and the development of the alveolar process also contribute to vertical growth. Apposition of bone at other surfaces causes the bone to develop a more adult shape. Thus, the mandible assumes a more forward position and a longer shape. The condylar growth centers are crucial in mandibular development. Each center consists of chondrogenic, cartilaginous, and osseous zones. A thin vascular layer covers the chondrogenic zone. Bone is deposited at the posterior borders of the rami and condyles.

Lets come to the point if the growth is concerned about the ossification center I would go for “a” as condyle has the growth center which consist of chondrogeni, catilagious and osseous zones but bone is also deposited along the posterior borders of the rami and condyles which shape the mandible then in terms of this “b” is also correct.

And your question is “The primary sites which are responsible for the mandibular growth is/are” according to your question “c” is the suitable answer. As ramus do not plays a significant role although bones get deposted at its posterior borders but another important thing is development of the alveolar process contributes to vertical growth of the mandible.

So, Condyle and Alveolar process would be my choice at it seems that your question demands two options if it was “The primary sites which is responsible for the mandibular growth is” then my choice would have been “a”.

thanks for the beautiful embryology review well i got this question while i was searching some things and according to them the answer is B)condyles and posterior border of ramus
well after i posted this i again went through it's ossfication in my anatomy book there was also thatsimilar explaination so i think the answer is correct.
and every bit of explaination for the mandible development by you correct and really helpfull for quick review.
well here are some facts about mandible.
mandible is the second bone next to clavicle to ossify in the body.it's grater part ossifies in membrane like you said and some part also ossifies in cartilage which include the incisive parts below the incisor teeth, the coronoid and condoloid process, and the upper half of ramus above the leval of madibular foramen.
Each half of the mandible ossifies form one center which appears at about 6th week of intrauterine lifein the mesenchymal sheath of Meckel's cartilage near teh future mental foramen.
well any way thaks oak bro for your explaination . it was touching

Oak

When I went through the question intially I thought the answer would be "b" then I went through the literature and found that alveolar process helps in the vertical growth of the mandible and ofcourse condyle is the supremo then I went for option "C"