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

Flashcards

Morphogenesis definition

The process of organ/body part development through organized interactions.

Optic vesicle's role

Induces lens development from head's surface.

Somites' function

Form axial skeleton and muscles.

Brain primordium formation

Neural folds thicken to form the brain.

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Mesonephric ridges' significance

Mark kidney site during week 5.

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Eye movement start week

Eye movement starts in the fetus at week 14.

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Fetal skeleton ossification period

Fetal skeleton's ossification occurs from weeks 13-16.

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Uterus formation week

Uterus start forming at week 21.

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Limb bud development period

Limb buds develop during weeks 4-8.

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Ear final position period

Ear positioning moves closer during weeks 17-20.

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Neonatal loss weight range

Most neonatal losses common under 2500 gm.

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