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aortic arches
①when does it exist ②where does it come from ③what Ⅲ,Ⅳ,Ⅵ develop into ①weeks 4-6
②sprout from aortic sac
③Ⅲ→common carotids
Ⅳ→lt aortic arch
rt right subclavian
Ⅵ→pulmonary arteries
(+left→ductus arteriosus)
embryology Apr 19, 2019, 3:05 AM   HirotoShishido

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sinus horn right sinus horn→openings of superior vena cava and inferior vena cava

left sinus horn→coronary sinus and oblique vein of left atrium(左心房斜静脈)
cardiology embryology Apr 19, 2019, 3:11 AM   HirotoShishido

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4 structure which is fused after the lateral folding dorsal aortae→aortic sac
heart tubes→primitive heart tube
vitelline veins→sinus venosus
pericardial cavities
cardiology embryology Apr 19, 2019, 2:57 AM   HirotoShishido

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heart before the lateral folding

bloodflow blood comes from vitelline vein go through heart tube, and then dorsal aorta
cardiology embryology Apr 19, 2019, 2:38 AM   HirotoShishido

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respiratory development stage1 pseudoglandular 腺様期

week5-16

main bronchus→secondary bronchi→tertiary bronchi→terminal bronchioles
embryology respiratory Apr 19, 2019, 1:24 AM   HirotoShishido

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respiratory development stage2 canalicular 菅状期

week16-26

terminal bronchioles develop into respiratory bronchioles

and then, pulmonary capillaries start to form

after week24, the first primitive alveoli is formed
embryology respiratory Apr 19, 2019, 12:29 AM   HirotoShishido

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respiratory development stage3 terminal sac 終末嚢期

week26〜birth

pneumocyte and capillary are formed
(able to exchange gas)
respiratory embryology Apr 19, 2019, 12:24 AM   HirotoShishido

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respiratory development stage4 alveolar 肺胞期

week36〜8yo

at birth 20-70million alveoli
8 yo 300〜400million alveoli
embryology respiratory Apr 19, 2019, 12:22 AM   HirotoShishido

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