Quicktime Development Animation - Heart Looping

From Embryology
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width=348px|height=460px|controller=true|autoplay=false</qt> Cardiac Looping

Cardiac looping occurs in humans from late in the fourth week to early in the fifth week. The heart tube is initially straight in an almost rostro-caudal (head-tail) direction) virtually fixed at the upper and lower ends. As the heart tube is grows and elongates it begins to fold or "loop" inside the pericardial cavity.

Links: Quicktime | Quicktime version | Flash version | Tutorial - Cardiac Looping | Cardiovascular System Development