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36 Cards in this Set
- Front
- Back
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Weeks 4 -8 are mainly characterized by what processes?
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organogensis
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Teratogens are most harmful during which weeks of pregnancy?
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4-8, organogenesis occurs here
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Folding of the embryo is caused by what property of the growing embryo?
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growth rate at the sides of the embryonic discs is slower than at the center = folding
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As the forebrain folds ventrally, the foregut is found between what structures?
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brain and heart
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As the forebrain folds ventrally, the _______ separates the foregut from the stomatomedum?
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oropharyngeal membrane
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The connecting stalk forms the ...
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umbilical cord
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Derivatives of paraxial mesoderm
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head muscle, skeletal muscle (trunk/limbs), skeleton (not cranium), dermis of skin, connective tissue
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Derivatives of intermediate mesoderm
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urogenital system
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Derivatives of Lateral mesoderm
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visceral connective tissue, pleural membranes, primordial heart, blood cells, spleen, adrenal cortex
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Derivatives of surface ectoderm
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epidermis, enamel, inner ear, lens of eye
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Derivatives of Neuroectoderm (neural crest)
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ganglia, adrenal medulla ...
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Derivatives of neural tube ectoderm
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CNS, retina, pineal body, posterior pituitary
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Epiblast layer is formed from what cells?
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embryoblast
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Derivatives of Head mesoderm
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Cranium, dentin
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The process of development of one structure affecting another structure's development is called ...
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induction
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Eye formation is induced by formation of ...
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optic vesicle
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3 molecular mechanisms of induction
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diffusion of signal, signal through matrix, physical interaction
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Neural tube is fully formed at what week?
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4
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The first pharyngeal arches are visible at what day?
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24
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3 pairs of pharyngeal arches are visible by what day?
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26
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Upper limb buds are recognizable by what day?
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26/27
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Otic pits and lens placodes are first seen during what week?
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4
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Caudal eminence characterizes what week?
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4
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4th pharyngeal arches and lower limb buds are seen at the end of what week?
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4
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Caudal neuropore is usually closed by the end of what week?
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4
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Overgrowth of the 2nd pharyngeal arch forms what structure?
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cervical sinus
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Cervical sinus formation is seen in what week?
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5
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Handplates and digital rays are seen in what week?
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6
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Auricular hillocks are seen in what week?
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6
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Notches in digital rays are first seen in what week?
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7
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Ossification of upper limb bones begins at end of what week?
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7
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Scalp vascular plexus is first seen in what week?
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8
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Digits are completely separate by what week?
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8
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Caudal eminence is disappeared at what week?
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8
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What is the most accurate way of measuring fetus age? fertilization date or LNMP
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fertilization date (within 12 hours of ovulation)
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The embryo finally has unquestionable human characteristics by the end of what week?
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8
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