Embryology; face & palate
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Questions and Answers

During which weeks of embryonic development does the external human face develop?

  • 4th to 6th week (correct)
  • 2nd to 4th week
  • 6th to 8th week
  • 8th to 10th week
  • At what point is the development of the face considered complete?

  • By the end of week 4
  • By the end of week 8
  • By the end of week 6 (correct)
  • By the end of week 5
  • What developmental stage occurs between the 6th and 8th week?

  • Development of the palate (correct)
  • Formation of the heart
  • Formation of limbs
  • Completion of the face
  • Which anatomical distinction is created as the palate develops?

    <p>Distinction between the nasal and oral cavities</p> Signup and view all the answers

    When does the palate's development reach completion?

    <p>By the 12th week</p> Signup and view all the answers

    Which of the following developments does NOT occur between the 4th and 8th week?

    <p>Completion of limb formation</p> Signup and view all the answers

    Which statement is true regarding embryonic facial development?

    <p>The palate development overlaps with face development.</p> Signup and view all the answers

    What major developmental milestone occurs by the end of the 6th week?

    <p>Complete face development</p> Signup and view all the answers

    What do the medial nasal processes merge to form?

    <p>Philtrum of the lip</p> Signup and view all the answers

    Which structure is formed by the fusion of the maxillary process and the intermaxillary segment?

    <p>Upper lip</p> Signup and view all the answers

    Which prominence is responsible for the formation of the forehead?

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

    What structure does the mandibular process specifically develop into?

    <p>Lower jaw</p> Signup and view all the answers

    Which of the following is NOT derived from the frontonasal prominence?

    <p>Sides of the nose</p> Signup and view all the answers

    The lateral nasal prominence contributes primarily to which facial structure?

    <p>Sides of the nose</p> Signup and view all the answers

    What do the medial nasal processes give rise to aside from the philtrum?

    <p>Primary palate</p> Signup and view all the answers

    Which structures are formed by the maxillary processes?

    <p>Cheeks and upper jaw</p> Signup and view all the answers

    The intermaxillary segment contributes to the formation of which facial feature?

    <p>Upper lip</p> Signup and view all the answers

    Which of the following derivatives is associated with the mandibular process?

    <p>Lower lip</p> Signup and view all the answers

    What is the primary structure formed by the fusion of the medial nasal prominence during palate development?

    <p>Intermaxillary segment</p> Signup and view all the answers

    At what week is the development of the secondary palate typically completed?

    <p>By week 12</p> Signup and view all the answers

    Which of the following is primarily responsible for the formation of cleft lip?

    <p>Failure of the medial nasal prominence and maxillary prominence to fuse</p> Signup and view all the answers

    During which critical period does the face and palate development occur?

    <p>Between weeks 6-12</p> Signup and view all the answers

    What can be a consequence of having cleft lip or cleft palate?

    <p>Trouble eating</p> Signup and view all the answers

    What is the primary function of the nasal placodes during embryonic development?

    <p>To develop into nasal pits</p> Signup and view all the answers

    Which of the following statements about cleft lip and palate is accurate?

    <p>Cleft lip/palate occurs around 4 times higher in native Americans.</p> Signup and view all the answers

    What structure is formed by the fusion of the medial nasal processes?

    <p>Upper lip</p> Signup and view all the answers

    In which anatomical planes do the palatal shelves fuse to form the secondary palate?

    <p>Horizontal and vertical planes</p> Signup and view all the answers

    Which of the following structures does NOT develop from the intermaxillary segment?

    <p>Lateral nasal processes</p> Signup and view all the answers

    During which weeks does the ectodermal tissue cover the lateral nasal processes?

    <p>Weeks 6-7</p> Signup and view all the answers

    What significant change occurs to the oronasal membrane around week 8?

    <p>It disintegrates to form nasal cavities</p> Signup and view all the answers

    Which anatomical feature connects the oral cavity and nasal passages during development?

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

    What separates the lateral and medial nasal processes during early development?

    <p>Naso-optic groove</p> Signup and view all the answers

    The nasal sacs develop from which embryonic structures?

    <p>Nasal pits</p> Signup and view all the answers

    Which component is a part of the upper portion of the facial skeleton developed during nasal formation?

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

    Which embryonic layer contributes to the formation of the nasal placodes?

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

    What is the primary role of the buccopharangeal membrane during early development?

    <p>To separate the stomodium from the foregut</p> Signup and view all the answers

    Which process is primarily involved in the development of the pouches and grooves necessary for craniofacial development?

    <p>Development of neural crest cells</p> Signup and view all the answers

    During the development of the first pharyngeal arch, what are the two processes that arise?

    <p>Maxillary and mandibular processes</p> Signup and view all the answers

    What initiates the formation of the nasal placodes in facial development?

    <p>Thickening of ectoderm on the frontal prominence</p> Signup and view all the answers

    What does the mandibular process lie near during the early stages of facial development?

    <p>The lower border of the stomodium</p> Signup and view all the answers

    At which week does the development of the face commence?

    <p>Week 4</p> Signup and view all the answers

    What shape do mesodermal cells surrounding the nasal placodes form during week 5?

    <p>Horseshoe shape swelling</p> Signup and view all the answers

    Which layer of the nasal placode's swelling is identified as the medial nasal process?

    <p>The inner layer</p> Signup and view all the answers

    Which structures are supported by the embryonic connective tissue developed from neural crest cells?

    <p>Pharyngeal pouches and grooves</p> Signup and view all the answers

    Which statement accurately describes the nature of the branchial arches?

    <p>They arise in pairs and maintain symmetry</p> Signup and view all the answers

    Study Notes

    Time Line Summary

    • The ectodermal human face develops between the 4th and 6th week of embryonic development.
    • Between the 6th and 8th week, the palate begins to develop.
    • This is complete by the 12th week.

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    Description

    This quiz covers the timeline of the ectodermal development of the human face from the 4th to the 12th week of embryonic growth, focusing on the critical stages of facial and palate formation. Test your knowledge on the key milestones in this fascinating process.

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