Endocardial cushions

Endocardial cushions
Interior of dorsal half of heart from a human embryo of about thirty days.
Gray's	subject #135 512
Carnegie stage	14
Days	27
Precursor	neural crest
Gives rise to	septum intermedium
Dorlands/Elsevier	c_68/12272771

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The lumen of the atrial canal is reduced to a transverse slit, and two thickenings appear, one on its dorsal and another on its ventral wall. These thickenings, or endocardial cushions as they are termed, project into the canal, and, meeting in the middle line, unite to form the septum intermedium which divides the canal into two channels, the future right and left atrioventricular orifices.

See also

• mesenchyme

External links

• Embryology at Temple Heart98/heart97a/sld033
• med/670 at eMedicine
• Overview at mcgill.ca

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.