3 ms·
If I not misheard (I don't know, just remember it), even the fetus development basically starts from the butthole.
by subscribed 3mo ago
If I not misheard (I don't know, just remember it), even the fetus development basically starts from the butthole.
- chungusamongus 3mo agoThat's beautiful
- throwaway173738 3mo agoI read somewhere that the first invertebrate animal ate and excreted through the same butthole-shaped oriface.
- rsa4046 3mo agoSome still do: it's called a gastrovascular cavity, and is present in marine invertebrates such as Cnidaria (jellyfish, coral polyps, anemones), Ctenophores (comb jellies); Platyhelminthes (flatworms, tapeworms).
- woadwarrior01 3mo agoYeah, I learnt about this from the amazing Max Bennett book: A brief history of intelligence.
- tremon 3mo agoThe embryo, not the fetus. Pretty sure that's referring to gastrulation, where the cell blob splits into multiple layers to start cell specialization; it does this by curving in on itself, and the cavity formed by this process becomes the intestinal tract: https://en.wikipedia.org/wiki/Gastrulation#Protostomes_versus_deuterostomes https://en.wikipedia.org/wiki/Gastrulation#Protostomes_versu... However, that all happens at the embryonic stage (around day 9). At the point where the embryo has advanced sufficiently to be called a fetus (around week 9), the body has already sufficiently developed so that it's impossible to say where "fetal development" starts: https://embryology.med.unsw.edu.au/embryology/index.php?title=Carnegie_stage_23#Introduction https://embryology.med.unsw.edu.au/embryology/index.php?titl...
- tremon 3mo ago> (around day 9) Typo; should be day 17/18.