Dental Development Morphogenic Stage Quiz

During which stage do the ameloblasts interact with the adjacent mesenchymal cells to determine the shape of the DE junction and the crown?

Morphogenic stage

Where are the Golgi apparatus and centrioles located in the ameloblasts during the morphogenic stage?

Proximal end of the cell

What appears concomitantly with the migration of mitochondria to the basal region of the ameloblast cell?

Terminal bars

What is the nature of the terminal bars that appear during ameloblast differentiation?

Thickening of opposing cell membranes Signup and view all the answers

What separates the inner enamel epithelium from the connective tissue of the dental papilla?

Basal lamina Signup and view all the answers

What happens in the organizing stage of development?

The inner enamel epithelium interacts with the adjacent connective tissue cells, which differentiate into ameloblasts Signup and view all the answers

What characterizes the adjacent pulpal layer?

Cell-free, narrow, light zone Signup and view all the answers

What characterizes the change in appearance of the cells of the inner enamel epithelium during the organizing stage?

They become longer, and the nucleus-free zones at the distal ends of the cells become almost as long as the proximal parts containing the nuclei Signup and view all the answers

What is suggested about the proteins secreted by preameloblasts during the organizing stage?

They are phagocytosed by developing odontoblasts Signup and view all the answers

What change takes place in preparation for development during the organizing stage?

The reversal of polarity, with migration of centrioles and Golgi regions from the proximal ends of the cells into their distal ends Signup and view all the answers

What is characteristic of the reversal of nutritional source during the organizing stage?

Gradual disappearance of the stellate reticulum and proliferation of capillaries in the dental sac Signup and view all the answers

What happens to the ameloblasts' source of nourishment when dentin forms during the organizing stage?

It is supplied by capillaries that surround and may even penetrate the outer enamel epithelium Signup and view all the answers

What happens during the terminal phase of the organizing stage?

The clear cell-free zone between inner enamel epithelium and dental papilla disappears Signup and view all the answers

What do special staining methods reveal during the organizing stage?

The presence of fine acidophil granules in proximal part of cell Signup and view all the answers

What is characteristic of the ameloblasts during their formative stage?

They secrete proteins similar to those in enamel matrix Signup and view all the answers

What happens when dentin is formed during the organizing stage?

It cuts off nutrient material supply from blood vessels Signup and view all the answers