Basic - Primitive Heart Tube: Difference between revisions
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[[File:HeartILP_draft_primitive_heart_tube.jpg|thumb|400px|The developing blood vessels and heart tube can be seen in an embryo at approximately 18 days]] | [[File:HeartILP_draft_primitive_heart_tube.jpg|thumb|400px|The developing blood vessels and heart tube can be seen in an embryo at approximately 18 days]] | ||
The heart is the first organ to function within an embryo. It starts to function at the beginning of the fourth week when the nutritional and oxygen requirements of the growing embryo can no longer be met by diffusion from the placenta. | The heart is the first organ to function within an embryo. It starts to function at the beginning of the fourth week when the nutritional and oxygen requirements of the growing embryo can no longer be met by diffusion from the placenta. | ||
The heart initially forms from two tubes located bilaterally (on either side) of the trilaminar embryo in the cranial (head) region. These first images show these primitive tubes developing in an embryo approximately 18 days after fertilization. | The heart initially forms from two tubes located bilaterally (on either side) of the trilaminar embryo in the cranial (head) region. These first images show these primitive tubes developing in an embryo approximately 18 days after fertilization. |
Revision as of 14:19, 30 September 2009
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The heart is the first organ to function within an embryo. It starts to function at the beginning of the fourth week when the nutritional and oxygen requirements of the growing embryo can no longer be met by diffusion from the placenta. The heart initially forms from two tubes located bilaterally (on either side) of the trilaminar embryo in the cranial (head) region. These first images show these primitive tubes developing in an embryo approximately 18 days after fertilization.