Sept 15 - Animals Lecture #3

Division along the midsaggital plane results in two

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division along the midsaggital plane results in two equal halves associated with cephalization controlled mobility, anterior of animal confronts environment first surfaces differentiate as dorsal (protection) and ventral
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Internal Architecture – Development & Cavities
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Pseudocoelom – “false coelom”
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). Consider patterns of cleavage and development in bilateral animals and how they can be used to categorize animal groups [see pages 59, 62 - 63, Animal Diversity 5th Keywords Within Bilateria 2 groups of animals (page 62 figure 3.8) Protostomia (called protostomes) – “mouth first” begin with spiral mosaic cleavage o formation of mouth from embryonic blastopore and anus forms secondarily Deuterostomia – ( deuterostomes) begin with radial regulative cleavage o Blastopore becomes anus “second mouth” formation of mouth from second opening in embryo Metamerism: “segmentation” serial repetition of similar body segments along longitudinal axis of body Each segment is called a metamere or somite e.g. worms, lobsters, fish scales Repetition of structural units Radial cleavage -cleavage planes are symmetrical to the polar axis and produce layers of cells on top of each other in an early embryo o Typical of echinoderms, chordates and hemichordates Spiral cleavage – differ than radial – rather than an egg dividing parallel or
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