The absolute opening statement of the Quranic revelation defines the biological blueprint of human creation:
Surah 92:1-12:
Recite in the name of your Lord who created—Created man from a clinging clot (ʿalaq).
The Philological Meaning: The word ʿalaq (plural of ʿalaqah) derived from the Arabic root ʿ-l-q, meaning to cling, stick, or hang. Historically, it denotes a thick, coagulated mass of blood, or a blood-sucking leech.
The Aristotelian/Galenic Heritage: To a historian of medicine, this sequence matches the pre-scientific embryological models that dominated the Late Antique Near East. Centuries prior, the Greek physician Galen (2nd century CE) had codified the stages of human development, explicitly stating that after the mixing of male and female generative fluids, the conceptus transforms into an unformed mass of pooling blood ("the form of a blood clot"). This flawed hypothesis was translated into Syriac and heavily integrated into the medical schools of pre-Islamic Arabia (such as the Academy of Gondishapur).
The Biological Reality: Modern human embryology completely invalidates the idea that a human being passes through a stage of being a blood clot. Following fertilization in the fallopian tube, the zygote undergoes rapid cellular division (cleavage) to become a solid ball of cells (morula) and then a hollow ball of cells (blastocyst). At no point during this highly organized, cellular process does the embryo turn into, or generate from, a static clot of maternal or coagulated blood. The text mistakes the visual, macroscopic observations of early miscarriages (which naturally resemble blood clots) for an accurate, microscopic blueprint of human development.