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THE KEY TO UNDERSTANDING ISLAM<br />
Diagram of the primordial cardiovascular system in an embryo of about 21 days, viewed<br />
from the left side. Observe the transi<strong>to</strong>ry stage of paired symmetrical vessels. (Keith<br />
Moore). Each heart tube continues dorsally in<strong>to</strong> a dorsal aorta that passes caudally.<br />
The external appearance of the embryo and its sacs is similar <strong>to</strong> that of a blood clot,<br />
due <strong>to</strong> the pres<strong>en</strong>ce of relatively large amounts of blood pres<strong>en</strong>t in the embryo.<br />
Cy<strong>to</strong>trophoblastic shell<br />
Tertiary<br />
chorionic villus<br />
Intervillous space<br />
Maternal blood<br />
Maternal sinusoid<br />
Section of an implanted embryo (about 21 days). In this diagram we can<br />
see the susp<strong>en</strong>sion of an embryo during the ‘Alaqah’ stage in the womb<br />
of the mother.<br />
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