After one month of pregnancy, the embryo' | vedclass

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Question

Summary of important development changes in the human embryo


	
		
			Time from Fertilisation
			
			Organ Formed
			
		
		
			$Week\; 1$

Vedclass · Accepted Answer

$A-$heart, $B$-second, $C-$first trimester, $D-$second trimester

Vedclass · Answer

Summary of important development changes in the human embryo


	
		
			Time from Fertilisation
			
			Organ Formed
			
		
		
			$Week\; 1$
			
			Fertilisation cleavage starts about $24\; hours$ after fertilisation leavage to form a blastocyst $4.5$ days after fertilisation. More than $100\; cells$ implantataion $6-9$ days fter fertilisation
			
		
		
			$Week\; 2$
			
			The three primary germ layers (ectoderm, endoderm and mesoderm) develop
			
		
		
			$Week\; 3$
			Woman will not have a period. This may be the first sign that she is pregnant. Beginning of the backbone. Neural tube develops, the beginning of the brain and spinal cord (first organs)
		
		
			$Week\; 4$
			Heart, blood vessels, blood and gut start forming. Umbilical cord developing
		
		
			$Week\; 5$
			Brain developing, 'Limb buds', small swelling which are the beginning of the arms and legs. Heart is a large tube and starts to beat, pumping blood. This can be seen an ultrasound scan
		
		
			$Week\; 6$
			Eyes and ears start to form
		
		
			$Week\; 7$
			All major intermal organs developing. Face forming. Eyes have some coloun Mouth and tongue develop. Beginning of hand and feet
		
		
			$Week\; 12$
			
			Foetus fully formed, with all organs, muscles, bones toes and fingers. Sex organs welldeveloped. Foetus is moving
			
		
		
			$Week\; 20$
			
			Hair beginning to grow including eyebrows and eyelashes. Fingerprints developed.Fingernails and toenails growing. Firm hand grip. Between $16$ and $20$ weeks baby usually felt moving for first time
			
		
		
			$Week\; 24$
			Eyelids open. Legal limit of abortion in most circumstances
		
		
			$Week\; 26$
			Has a good chance of survival if born prematurely
		
		
			$By\; Week\; 28$
			Baby moving vigorously. Responds to touch and loud noises. Swallowing amniotic fluid and urinating
		
		
			$By\; Week\; 30$
			Usually lying head down ready for birth
		
		
			$By\; Week\; 40$
			Birth

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