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L5 Evo & Devnt - only briefly Modification of the 6...

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Haeckel, von Baer
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Ontogeny recapitulates phylogeny 3 examples of this principle head head vasculature u-g system
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The vertebrate head Brachiomeric organisation
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Skate embryo
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Brachiomeres formed by migrating neural crest and filling up indentations in the ectoderm
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Components of a brachiomere - nerve, muscle, cartilage, blood vessel
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Nerve comes from nearby CNS/neural crest Cartilage differentiates from neural crest Blood vessel from aorta Muscle from somites
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What about us?
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Trigeminal (V) Facial (VII) Glossopharylgeal (IX) Vagus (X)
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Orofacial clefting
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Heart and circulatory system
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Heart fate map
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truncus arteriosus bulbus cordis primitive ventricle atrioventricular canal primitive atrium sinus venosus ANT POST Now starts looping
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Loops to right 24 days 25 days
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Unformatted text preview: only briefly Modification of the 6 arch ground plan U-G system Allantois Yolk sac Urorectal septum allantois U-g tract Anal canal & rectum Cloacal membrane Perineal body Allantois grows and swells to become the bladder Nephric system Gonads Genital ducts Segmental structures called nephrotomes form from anterior end in sequence. Nephrotome form a simple duct in each segment and an archinephric duct which joins each nephrotome up. Branch of dorsal aorta buds out into each nephrotome. Simple kidney which drains in to coelom = PRONEPHROS (HOLONEPHROS) Seen in ANAMNIOTES embryos and larvae and hagfish MESONEPHROS forms from posterior nephrotomes Seen in embryos and larvae of AMNIOTES METANEPHROS is functional kidney in amniotes Each of these stages can be seen in human embryos. Mesonephros becomes part of male genital duct system....
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