1- Embryology
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Questions and Answers

What is the definition of induction in the context of cell biology?

  • The process by which cells become competent to respond to inductive signals.
  • The development of a group of cells by another group of cells with different properties.
  • The ability of a cell or tissue to respond to a specific inductive signal.
  • The interaction at close range between two or more cells or tissues with different histories and properties. (correct)

    • What does competence refer to in cell biology?

  • The process by which cells become competent to respond to inductive signals.
  • The development of a group of cells by another group of cells with different properties.
  • The ability of a cell or tissue to respond to a specific inductive signal. (correct)
  • The interaction at close range between two or more cells or tissues with different histories and properties.

    • What is the role of inducing tissue in the process of induction?

  • The ability of a cell or tissue to respond to a specific inductive signal.
  • Directs the development of another group of cells, the responding tissue. (correct)
  • The interaction at close range between two or more cells or tissues with different histories and properties.
  • The process by which cells become competent to respond to inductive signals.

    • What is the process by which cells change their characteristics and establish a new population of cells?

    <p>Differentiation</p> Signup and view all the answers

    What occurs when successive generations of cells in a compartment change their characteristics?

    <p>Differentiation</p> Signup and view all the answers

    What is the consequence of the failure to fuse the medial and lateral nasal processes?

    <p>Development of a cleft lip</p> Signup and view all the answers

    At what stage of intrauterine life do the two palatal shelves come into contact?

    <p>8 weeks</p> Signup and view all the answers

    Which process produces the medial and lateral nasal processes?

    <p>Frontal process</p> Signup and view all the answers

    At what stage of intrauterine life does bone formation start at the mental foramen?

    <p>7 weeks</p> Signup and view all the answers

    When does ossification of the maxilla start?

    <p>8 weeks</p> Signup and view all the answers

    How does growth of the maxilla primarily occur?

    <p>By sutural growth and bone remodeling</p> Signup and view all the answers

    What is the primary role of the dental lamina in tooth development?

    <p>Formation of tooth germ</p> Signup and view all the answers

    Which structure forms the vestibule in tooth development?

    <p>vestibular band</p> Signup and view all the answers

    What are the three stages of tooth germ development in order?

    <p>Bud, cap, bell</p> Signup and view all the answers

    What is the structure that forms the pulp in tooth development?

    <p>Dental papilla</p> Signup and view all the answers

    What does the Hertwig’s root sheath loop to form during the BELL stage of tooth development?

    <p>Root</p> Signup and view all the answers

    What does the inner enamel epithelium develop into during tooth development?

    <p>Enamel</p> Signup and view all the answers

    What does the Dental Papilla form during tooth development?

    <p>Dentin and Pulp</p> Signup and view all the answers

    Which structure is responsible for producing Cementum, PDL, and Alveolar bone?

    <p>Dental Follicle</p> Signup and view all the answers

    What is the primary contribution of the Enamel Organ in tooth development?

    <p>Enamel</p> Signup and view all the answers

    What is the location where the outer enamel epithelium and inner enamel epithelium join called?

    <p>Cervical loop</p> Signup and view all the answers

    What do the cells of the cervical loop develop into?

    <p>Hertwig's epithelial root sheath</p> Signup and view all the answers

    What is the composition of the enamel organ?

    <p>Outer enamel epithelium, inner enamel epithelium, stellate reticulum, stratum intermedium</p> Signup and view all the answers

    Which structures are part of the enamel organ?

    <p>Stellate reticulum, stratum intermedium</p> Signup and view all the answers

    What is the primary role of the dental papilla in tooth development?

    <p>Forming the dentin of the tooth</p> Signup and view all the answers

    What determines the shape of a tooth's crown?

    <p>Junction between the dental papilla and inner enamel epithelium</p> Signup and view all the answers

    What is responsible for the formation of the tooth pulp?

    <p>Ectomesenchymal cells within the dental papilla</p> Signup and view all the answers

    What important entities does the dental follicle give rise to?

    <p>Cementoblasts, osteoblasts, fibroblasts</p> Signup and view all the answers

    Which cells are not derived from the dental follicle?

    <p>Ameloblasts</p> Signup and view all the answers

    Which cells are responsible for making the periodontal ligament connecting teeth to the alveolar bone?

    <p>Fibroblasts</p> Signup and view all the answers

    What do cementoblasts produce in the context of tooth structure?

    <p>Cementum</p> Signup and view all the answers

    What is the primary role of osteoblasts in tooth development?

    <p>Creating alveolar bone</p> Signup and view all the answers

    What are the three types of epithelium at the dentogingival junction?

    <p>Gingival, sulcular, and junctional epithelium</p> Signup and view all the answers

    From which cells does the junctional epithelium form?

    <p>Reduced enamel epithelium</p> Signup and view all the answers

    What happens to the remnants of ameloblasts as the junctional epithelial layer increases in size?

    <p>They form the sulcus</p> Signup and view all the answers

    When does cellular cementum develop in tooth formation?

    <p>After most of the tooth formation is complete</p> Signup and view all the answers

    What triggers the cementoblasts to reach the surface of the tooth’s root?

    <p>Deterioration of Hertwig’s epithelial root sheath</p> Signup and view all the answers

    At what stage does acellular cementum form in tooth development?

    <p>Before Hertwig’s epithelial root sheath deteriorates</p> Signup and view all the answers

    What is the first type of cementum to form in tooth development?

    <p>Acellular cementum</p> Signup and view all the answers

    When do cementoblasts forming the last layer become trapped in the cementum?

    <p>After most of the tooth formation is complete</p> Signup and view all the answers

    What happens to cementoblasts after mineralization of the cementum?

    <p>They move away from the cementum and join the forming periodontal ligament</p> Signup and view all the answers

    What is the primary function of cementoblasts as they move away from the cementum?

    <p>Depositing more collagen to thicken the bundles of fibers</p> Signup and view all the answers

    What is the primary role of fibroblasts in the formation of the periodontal ligament?

    <p>To secrete collagen which interacts with fibers on the surfaces of adjacent bone and cementum</p> Signup and view all the answers

    What is the main function of collagen secretion in the context of periodontal ligament formation?

    <p>To interact with fibers on the surfaces of adjacent bone and cementum leading to an attachment</p> Signup and view all the answers

    What is the primary source of osteoblasts in the formation of the alveolar bone?

    <p>Dental follicular cells</p> Signup and view all the answers

    Where are collagen fibers initially secreted in the process of alveolar bone formation?

    <p>On the surface nearest the tooth</p> Signup and view all the answers

    What happens to collagen fibers after mineralization in the formation of the alveolar bone?

    <p>They attach to the periodontal ligament</p> Signup and view all the answers

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