Quran's scientific miracle in revealing that " the sense of hearing develops before seeing, as well the heart is the first organ to develop and function in the embryo."
By: mohamad massarweh
It is He Who gave you hearing, sight and hearts. How little you give thanks! [23:78
Three weeks after fertilization, the human embryo develops to a "gastrula" a sphere that contains three stem cell layers (germ layers). The Germ layers are arranged one on the top of the other. Ectoderm is the exterior and the adjacent layer to the uterine lining; it differentiates to brain and nerves. During the third week "Otic placode", a small nerval plate, rises from the brain area for differentiating to the auditory and ear nerves.
By the end of the third and the beginning of the fourth weeks, the Optic placode appears and starts differentiating to the optical and eye nerves.
In day 19, two tiny blood vessels "Endocardial tubes" appear in the " Mesoderm", the middle layer of the gastrula, the endocardial tubes grow in parallel till they meet and coalesce to form the heart.
In the fourth week, days 22-23 the heart starts beating and pumping the blood, to be the first organ to function in the embryo. Noteworthy, The Human embryo is the only creature among mammals and vertebras who develop the sense of hearing before the vision.
References
https://web.archive.org/web/20131201081856/http://www.healthline.com/galecontent/prenatal-development
http://biology.kenyon.edu/courses/biol114/Chap14/Chapter_14.html
https://embryology.med.unsw.edu.au/embryology/index.php/Placodes
https://discovery.lifemapsc.com/library/review-of-medical-embryology/chapter-114-development-of-the-heart-cardiac-tube-development
