The "veils of darkness" are: (1) the anterior abdominal wall; (2) the uterine wall, and (3) the amniochorionic membrane.
"Then We placed him as a drop in a place of rest."
It also indicates that out of the chewed lump stage, bones and muscles form. This is in accordance with embryological development. First the bones form as cartilage models and then the muscles (flesh) develop around them from the somatic mesoderm.
"Then We developed out of it another creature."
This next part of the ayat implies that the bones and muscles result in the formation of another creature. This may refer to the human-like embryo that forms by the end of the eighth week. At this stage it has distinctive human characteristics and possesses the primordia of all the internal and external organs and parts. After the eighth week, the human embryo is called a fetus. This may be the new creature to which the verse refers.
Al-Quran, surah As-Sajdah, verse 9
"And He gave you hearing and sight and feeling and understanding."
This verse indicates that the special senses of hearing, seeing, and feeling develop in this order, which is true. The primordia of the internal ears appear before the beginning of the eyes, and the brain (the site of understanding) differentiates last.
Al-Quran, surah Al- Hajj, verse 5
"Then out of a piece of chewed flesh, partly formed and partly unformed."
This verse tell us that the embryo is composed of both differentiated and undifferentiated tissues. For example, when the cartilage bones are differentiated, the embryonic connective tissue or mesenchyme around them is undifferentiated. It later differentiates into the muscles and ligaments attached to the bones.
"And We cause whom We will to rest in the wombs for an appointed term."
This seems to imply that God determines which embryos will remain in the uterus until full term. It is well known that many embryos abort during the first month of development, and that only about 30% of zygotes that form, develop into fetuses that survive until birth. This verse has also been interpreted to mean that God determines whether the embryo will develop into a boy or girl.
This shows the powerful of the Quran, Quran which have every knowledge that we need to live in this world.
I hope this post will bring some understanding that the Quran is related to the human development. insyaAllah will give u a knowledge on how you are being formed in your mums womb.
take care,
salam