Assalamu alaikum wa rehmatullahi wa barakatuh
The Quran revealed by Allah Almighty,mentions that formation of muscles (myogenesis) occurs before the formation of bones (osteogenesis).
Then We made the sperm-drop into a clinging clot, and We made the clot into a lump [of flesh], and We made [from] the lump, bones, and We covered the bones with flesh; then We developed him into another creation. So blessed is Allah , the best of creators.(23:14)
A leech like structure is formed at first
Later on the lump of flesh is formed
Then the bones
And then the bones are covered by the flesh again.This is told in Quran.
And this is 100% true!
Clinging clot occurs in the earliest stages of embryogenesis.(upto 2nd week).
Formation of mesoderm and somatogenesis occur in 3rd week. A Lump of Flesh.
And formation of bones start in 7th week.
Note the bony skeleton.See the cranium and the rib cage at 7 weeks of pregnancy.
This is the picture of a full term baby,note that the baby’s skeleton is covered by the flesh,ie wrapping of bones by the flesh.