is a curved, semi flexible lower end of the backbone
(vertebral column) in humans, representing a vestigial tail.
It is composed of three to five successively smaller caudal
(coccygeal) vertebrae. The first is a relatively
well-defined vertebra and connects with the sacrum; the last
is represented by a small nodule of bone. The spinal cord
ends above the coccyx. In early adulthood the coccygeal
vertebrae fuse with each other; in later life the coccyx may
fuse with the sacrum. Coccyx, the last bone in the
vertebral column was mentioned in many Hadiths that this
bone is the origin of humans and the seed from which they
will be resurrected on the Day of Judgment and that this
part doesn’t decay in the earth.
Stages of foetus formation:
When the sperm fecundate the ovule, foetus formation starts.
The fecundated ovule or the zygote divides into 2 cells, and
each cell divides into another 2 cells. Cells division and
growth continue until the formation of the embryonic disk
that contains 2 layers:
• External “Epiblast”: contains the cytotrophoblasts that
fix the embryo in the uterus wall and enable its nutrition
from the blood and the secretions of the glands of the
• Internal “Hypoblast”: From which the foetus is formed with
the Will of Allah The Almighty. On the day15 the primitive
streak appears in the dorsal aspect of the embryo with a
pointed end called the primitive node.
The side on which the primitive streak appears is known as
the back of the embryonic disc. From the primitive streak
and node all the foetus tissues and organs are formed as
• The Ectoderm: gives the skin and the central nervous
• The Mesoderm: gives the digestive tract smooth muscles,
the skeletal muscles, the circulation system, the heart, the
bones the sexual and urinary systems (except the bladder),
the subcutaneous tissues, the lymphatic system, the spleen
and the cortex.
• The Endoderm: the linings of the digestive tract and the
respiratory system, the organs related to the digestive
tract (ex: liver and pancreas), the bladder, the thyroid
gland, the hearing canal.
After that, the primitive streak and node become emaciated
and reside in the sacral zone, in the last vertebrae, so
that the coccyx is formed.
Foetus malformation is a proof that
the coccyx contains the mother cells for all the human
the creation and formation of the foetus from the primitive
streak and the primitive node, those reside in the last
vertebrae of the sacrum (the coccyx) and retain their
characteristics. If those are motivated somehow, they start
to grow similarly to the foetus growth and so give a tumour
(Teratoma) that resembles a defective foetus with some
organs fully formed (hands or feet with nails). Therefore
the sacrum indeed contains the mother cells and what the
prophet (PBUH) said about the Resurrection of humans from
their coccyx on the Day of Judgment has been proved.
The conclusion: the coccyx contains the primitive streak and
primitive node and those are able to grow giving the three
layers that form the foetus: ectoderm, mesoderm and endoderm
and so can give all the organs as the surgeon when opening
the tumour previously mentioned found fully formed organs
inside it like teeth, hair…
Humans can be then recreated from their coccyx that contains
the primitive streak and node of the overall potential.
And so the coccyx can not get
Researchers found that foetus cells’ formation and
organisation are exerted by the primitive streak and node
and before their formation no cells’ differentiation could
have taken place. One of the most famous researchers who
proved this was the German scientist Hans Spemann.
After his experiments on the primitive streak and node he
found that those organise the creation of the foetus and so
he called them “The primary organiser”. He cut this part
from one foetus and implanted it in another one in the
primary embryonic stage (third and fourth week). This lead
to the formation of a secondary foetus in the guest body due
to the influence and organisation exerted by the surrounding
guest’s cells on the implant.
The German scientist started his experiments on the
amphibians by implanting the primary organiser in a second
foetus, which led to the growth of a secondary embryo. The
implantation of the cut primary organiser was in another
foetus of the same age under the Epiblast layer and lead to
the apparition of a secondary embryonic anlage.
In 1931, when Spemann crushed the primary organiser and
implanted it again, the crushing did not affect the
experiment as again, a secondary embryonic anlage grew.
In 1933, Spemann and other scientists conducted the same
experiment but the primary organiser was boiled this time. A
secondary embryonic anlage grew in spite of the boiling
showing that the cells were not affected. In 1935, Spemann
was awarded the Nobel Prize for his discovery of the Primary
Narrated By Al-Amash: Abu Huraira said, "Allah's
Apostle said, 'Between the two sounds of the trumpet, there
will be forty." Somebody asked Abu Huraira, "Forty days?"
But he refused to reply. Then he asked, "Forty months?" He
refused to reply. Then he asked, "Forty years?" Again, he
refused to reply. Abu Huraira added. "Then (after this
period) Allah will send water from the sky and then the dead
bodies will grow like vegetation grows, There is nothing of
the human body that does not decay except one Bone; that is
the little Bone at the end of the coccyx of which the human
body will be recreated on the Day of Resurrection."