Embryology: Third Week of Development
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Questions and Answers

What is the term for the process during which complex interactions occur in an orderly sequence to develop the shape, size, or features of a particular organ or part of the body?

  • Morphogenesis (correct)
  • Arteriocapillary fusion
  • Pharyngeal arching
  • Vasculogenesis
  • Which structure induces the development of the lens from the surface ectoderm of the head?

  • Somites
  • Otic vesicle
  • Mesenchyme
  • Optic vesicle (correct)
  • What gives rise to the axial part of the skeleton and associated musculature?

  • Neural tube
  • Somites (correct)
  • Endocardial heart tubes
  • Pharyngeal arches
  • What occurs when the neural folds in the cranial end have thickened to form the primordium of the brain?

    <p>Formation of limb buds (D)</p> Signup and view all the answers

    Which structure indicates the site of the kidneys during the fifth week of development?

    <p>Mesonephric ridges (D)</p> Signup and view all the answers

    At what week does eye movement begin in the fetus?

    <p>14 weeks (D)</p> Signup and view all the answers

    Which period marks the ossification of the fetal skeleton?

    <p>Thirteenth to Sixteenth Weeks (C)</p> Signup and view all the answers

    During which week does the uterus start to form in the developing fetus?

    <p>21 weeks (C)</p> Signup and view all the answers

    When do limb buds start to develop in the fetus?

    <p>Fourth to Eighth Weeks (B)</p> Signup and view all the answers

    During which period do the ears move closer to their final position?

    <p>Seventeen to Twenty Weeks (C)</p> Signup and view all the answers

    At what weight range are neonatal losses most common?

    <p>2500 gm or less (A)</p> Signup and view all the answers

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