Embryology in Islamic Scripture

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This article analyzes what the Islamic texts have to say regarding embryology.

The Qur'an and Sahih Hadith

“Islamic embryology” is derived from both the Qur’an and the hadith, and is quite consistent across all the contributing sources. The core of the story can be found in the Qur’an, 22:5.

Yusuf Ali: “O mankind! if ye have a doubt about the Resurrection, (consider) that We created you out of dust, then out of sperm, then out of a leech-like clot, then out of a morsel of flesh, partly formed and partly unformed, in order that We may manifest (our power) to you; and We cause whom We will to rest in the wombs for an appointed term, then do We bring you out as babes…”

Pickthal: “O mankind! if ye are in doubt concerning the Resurrection, then lo! We have created you from dust, then from a drop of seed, then from a clot, then from a little lump of flesh shapely and shapeless, that We may make (it) clear for you. And We cause what We will to remain in the wombs for an appointed time, and afterward We bring you forth as infants…”

Shakir: “O people! if you are in doubt about the raising, then surely We created you from dust, then from a small seed, then from a clot, then from a lump of flesh, complete in make and incomplete, that We may make clear to you; and We cause what We please to stay in the wombs till an appointed time, then We bring you forth as babies…”

Here we find the three primary stages of embryonic development as defined by the Qur’an. There is a “seed,” “drop” or “semen” phase (in Arabic, “nutfah”), followed by a “clot” or “leech-like clot” phase (in Arabic, “alaqah”), followed finally by a “morsel of flesh” or “chewed lump” phase (in Arabic, “mudghah”).

There are a handful of additional ayaat that deal with this subject, and none of them disagree with this basic scenario. Yet there is more to learn from the hadith, particularly that of Bukhari and Muslim. Again, the accounts are quite consistent, and the additional information they provide is important. The first of these tells us about developmental timing:

Narrated 'Abdullah bin Mus'ud: “Allah's Apostle, the true and truly inspired said, "(The matter of the Creation of) a human being is put together in the womb of the mother in forty days, and then he becomes a clot of thick blood for a similar period, and then a piece of flesh for a similar period.”

These exact details are also given in Sahih Bukhari 4:55:549, Sahih Bukhari 8:77:593, Sahih Bukhari 9:93:546, and Sahih Muslim 33:6390.

The key information gained from all these ahadith are that the three phases (nutfah, alaqah and mudghah) each takes 40 days, for a total period of 120 days from conception to the point at which the embryo becomes a fetus.

One additional piece of testable scientific information is available in the hadith. It has to do with the point at which gender is determined. A representative hadith would be the following from Sahih Bukhari:

Narrated Anas bin Malik: “The Prophet said, "Allah puts an angel in charge of the uterus and the angel says, 'O Lord, (it is) semen! O Lord, (it is now) a clot! O Lord, (it is now) a piece of flesh.' And then, if Allah wishes to complete its creation, the angel asks, 'O Lord, (will it be) a male or a female?”

This detail is repeated in Sahih Bukhari 4:55:550 and Sahih Muslim 33:6397, and all of them are quite clear that the embryo is neither male nor female until after the mudghah phase is reached, some 80 days (by Islamic counting) after conception.

So, then, these are the details of embryology as reflected in the Qur’an and the hadith.

  1. The embryo spends 40 days as a drop of sperm or seed.
  2. The embryo then spends another 40 days as a “clot” or a “leech-like clot” of blood.
  3. The embryo then spends another 40 days as a “lump of flesh.”
  4. During this last stage, the gender of the child is assigned by an angel at Allah’s direction.

Points of Discussion

Timing of Islamic Phases

Taken together, the three phases of Islamic embryology take 120 days to go from conception to the point where the embryo becomes a fetus (i.e. an identifiable human baby), or right around 17 weeks.

Science, however, shows us that the human embryo becomes a fetus around week 9, or roughly half the time Islamic embryology requires. By day 56 the fetus is essentially a complete, though tiny, human being with all organ systems in place, and all tissues developed. This is right in the middle of what Islam calls the “alaqah” phase. In other words, the developing person is already a complete human being at a point where the hadith insists it (not he or she) still has almost three weeks remaining as a “clot of congealed blood.”

In fact, there are no developmental milestones which can be mapped to the three 40 day periods required by Islamic embryology, even as several authoritative ahadith stress these phases.

Description of Islamic Phases

The three Islamic phases of development are described in a very visual way, allowing for an informed evaluation of the accuracy of those descriptions. Considering that at Muhammad's time, only objects of such a scale that would be visible to the unaided could be imagined, this is perhaps unsurprising.

Indeed, each of the three Islamic stages is described at a visible level of scale. A drop of seed, a clot of blood, a lump of flesh; all of them are objects of a size with which the ancient Arabs would have been familiar.

The “Drop of Seed” Phase (Nutfah)

There is little to no debate among Muslims as to the meaning of the word, “nutfah.” It is a “drop of seed” or “drop of semen” of the sort that would have been familiar to any adult Arab male. The Arabs rightly understood (as did all of their non-Arab neighbors) that semen was necessary to begin the process of procreation. But, exactly as with all their non-Arab neighbors, the writers of the Qur’an and the hadith did not seem to understand that there was an egg produced by the mother that is fertilized by the male’s semen.

The Arabs believed that the woman served simply as an incubator for a child that was fully contained in the father’s seed. There was no understanding of the actual biology of sexual reproduction, and no such understanding is apparent in the Qur’an.

Indeed, the Qur’an tells us that the “drop of seed” remains exactly that (a drop of seed) for the entire nutfah phase (40 days according to Bukhari and Muslim).

However, the actual “drop of seed” provided by the male dissipates within minutes of ejaculation, so even before conception, the literal “drop of seed” no longer exists. The case could certainly be made that the fertilized egg resembles a seed until about day 13 or fourteen, but the “drop” is long gone, replaced with a microscopic egg that moves through a period called the “blastocyst.” But by the beginning of the third week, the embryo has already begun to differentiate into a trilaminar embryo with the three layers of ectoderm, mesoderm, and endoderm. A mere two and a half weeks after conception, the embryo no longer looks anything like a “drop of seed,” while the Islamic tradition indicates that the nutfah stage should last for an additional three weeks.

By day 40 of actual embryonic development (when the “drop” stage should be just ending and the “clot” stage beginning) the embryo is actually very well advanced. Measuring some 11 millimeters long, and the nervous system is well along its development. The embryo has eyes and ears, all four limbs have begun to form, the heart bulge is prominent. It bears no resemblance at this point to either a “drop of seed” or a “leech-like clot.”

The “Leech-Like Clot” Phase (Alaqah)

The word “alaqah” is a bit more ambiguous than “nutfah,” and so has been translated a bit more flexibly by apologists. Although consistently translated as a “clot of blood” by multiple translators, there are a handful of instances where it is rendered as “a leech-like clot.” This is the phase that (according to Bukhari and Muslim) should last from about day 41 to day 80 after conception.

Among the many images of Allah’s creative power reflected in the Qu’ran and the hadith, the image of man having been created from a clot of blood is one of the most common, showing up over a dozen times in the Qu’ran, Sahih Bukhari and Sahih Muslim alone.

The period of development covered by the “alaqah” stage includes from week six until week eleven after conception. The first two weeks of this “phase” actually encompass the final two weeks of embryonic development, for at that point the baby is essentially completely formed, and from here on out is known as a fetus.

Interestingly, at no time during this period (or any period for that matter) does the embryo or fetus resemble a “clot.” And while dependence of the placenta might be described as being vaguely “leech-like” in that it is attached to the uterine wall, no one would ever confuse the embryo or fetus with a leech.

This is as good a point as any to point out that embryonic development is essentially over by day 56, or in less than one half of the time described by Islamic embryology.

For over three weeks of the supposed “alaqah” phase, rather than a “leech-like clot” the fetus is actually a fully formed human being, ranging in size from 35 mm to about 80 mm in length.

The “Lump of Flesh” Phase (Mudghah)

The Arabic word “Mudghah” is uniformly described as a “lump” or “morsel of flesh.” Sometimes, it is more descriptively referred to as a “chewed lump of meat.” According to the hadith, this phase would cover day 81 to 120 of fetal development, or weeks 12 through 17.

However, rather than a “lump” of anything, this period is one primarily of increasing size for the already fully formed fetus. During this period of time the fetus grows finger and toenails, begins to grow hair, and by the end of it the mother is beginning to feel the child’s movements. At no time during these weeks does the fetus look like anything other than a fully formed human being, fingers and all.

If there were anytime during which the embryo might be described as a “lump of flesh,” that would have been much earlier, perhaps during the fourth week. But even then, the embryo was quite organized and complex, hardly “chewed” in any sense of the word.


According to multiple ahadith, it is only after the mudghah phase (days 81-120) that an angel of the Lord determines the gender of the baby. But in fact, modern genetics shows that the gender of the baby is determined at the moment of conception, nearly four months before the Islamic date of gender differentiation.

The interpretations of Dr. Keith Moore

In articles published widely across Islamic websites, Keith L. Moore goes on the record to provide a favorable assessment of the Qur’an and hadith in the light of modern knowledge about embryology. But a review of his “analysis” shows the incredibly liberal interpretation he has to use for both the Islamic scriptures and modern science in order to arrive at an interpretation that allows the known facts of embryology and the Islamic scriptures to be in harmony:

1. He translates Arabic into terms that no Arabic speaker would consider justified, but that allows him to pretend the Arabic is closer to truth than it really is. For example, in spite of the fact that almost all translations of “alaqah” agree that its meaning in the Qur'an is “clot,” Moore writes instead that “The word "alaqah" refers to a leech or bloodsucker”, which may be true in some other circumstances but is almost certainly not the case here.

2. He ignores the timing of phases dictated by the hadith, for to consider them renders even his mistranslation unintelligible. For example, after mistranslating “alaqah” to mean “a leech or bloodsucker,” he then compares it to the human embryo at 24 days gestation. But 24 days is still firmly within the “nutfah” phase, when the embryo should actually look like a “drop of seed.” He does the same with “mudghah,” comparing it with the embryo at 28 days, still in the “nutfah” phase and only four days later than he had assigned to “alaqah.”

See Also

  • Embryology - A hub page that leads to other articles related to Embryology


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