Changes

||'''Week 1'''- fertilized oocyte, zygote, pronuclei, morula cell division with reduction in cytoplasmic volume, blastocyst formation of inner and outer cell mass, loss of zona pellucida, free blastocyst, attachment of blastocyst

||'''Week 1'''- fertilized oocyte, zygote, pronuclei, morula cell division with reduction in cytoplasmic volume, blastocyst formation of inner and outer cell mass, loss of zona pellucida, free blastocyst, attachment of blastocyst

'''Week 2'''- implantation, extraembryonic mesoderm, primitive streak, gastrulation

'''Week 2'''- implantation, extraembryonic mesoderm, primitive streak, gastrulation

'''Week 3''' - gastrulation, notochordal process, primitive pit, notochordal canal, Somitogenesis, cardiac primordium, head fold

'''Week 3''' - gastrulation, notochordal process, primitive pit, notochordal canal, Somitogenesis, cardiac primordium, head fold

'''Week 4''' - neural fold fuses, rostral neuropore closes, caudal neuropore closes

'''Week 4''' - neural fold fuses, rostral neuropore closes, caudal neuropore closes

|-

|-

•elevated/irregular shape (arbuda)- eunuch (napumsaka)  

•elevated/irregular shape (arbuda)- eunuch (napumsaka)  

50th  day- formation of buds of future body  parts (ankura)  || *'''Week 5'''- leg buds, lens placode, pharyngeal arches, lens pit, optic cup, lens vesicle, nasal pit, hand plate

50th  day- formation of buds of future body  parts (ankura)   

|| '''Week 5'''- leg buds, lens placode, pharyngeal arches, lens pit, optic cup, lens vesicle, nasal pit, hand plate

'''Week 6'''-nasal pits moved ventrally, auricular hillocks, foot plate, finger rays

'''Week 6'''-nasal pits moved ventrally, auricular hillocks, foot plate, finger rays

•five buds or projections (panchapindika)- arms (hasta),legs (pada) and head(shira),differentiation of major and minor parts (anga-pratyanga)  

•five buds or projections (panchapindika)- arms (hasta),legs (pada) and head(shira),differentiation of major and minor parts (anga-pratyanga)  

•achieves consciousness and feelings(vedana) ||*'''9-12 weeks –''' In the beginning of 9th week, head constitutes half of the crown-heel length of the foetus, and by the end of 12th week, crown-rump length almost doubles.

•achieves consciousness and feelings(vedana)  

||'''9-12 weeks –''' In the beginning of 9th week, head constitutes half of the crown-heel length of the foetus, and by the end of 12th week, crown-rump length almost doubles.

Broad face, eyes get widely separated, ears-low set, eye lids get fused, by the end of 12th week-primary ossification centres appear in the cranium and long bones, external genitalia develop, intestinal coils are clearly visible

Broad face, eyes get widely separated, ears-low set, eye lids get fused, by the end of 12th week-primary ossification centres appear in the cranium and long bones, external genitalia develop, intestinal coils are clearly visible

•All major and minor parts become clearly demarcated, expresses desires in objects of sense organs.

•All major and minor parts become clearly demarcated, expresses desires in objects of sense organs.

Head gets excellent development (shira saravat bhavet) during 3 ½ months and appearance of lanugo(loma)|| *'''13-16 weeks-'''Growth - rapid growth continues

Head gets excellent development (shira saravat bhavet) during 3 ½ months and appearance of lanugo(loma)

||'''13-16 weeks-'''Growth - rapid growth continues

•Head - head has straightened up

•Head - head has straightened up

•Mind (manas) becomes more enlightened

•Mind (manas) becomes more enlightened

•foetus becomes more capable of living (sujeeva) || *'''17-20 weeks-'''Growth - Length growth begins to slow.

•foetus becomes more capable of living (sujeeva)  

||'''17-20 weeks-'''Growth - Length growth begins to slow.

•Body parts have acquired their relative proportions.

•Body parts have acquired their relative proportions.