septum primum


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Related to septum primum: Ostium primum, foramen ovale

septum primum

[′sep·təm ′prē·məm]
(embryology)
The first incomplete interatrial septum of the embryo.
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References in periodicals archive ?
The tunnellike configuration between the septum primum and the septum secundum, which indicates the presence of a PFO (blue arrow).
It is also believed that this area is probably formed by different embryological components.10 In the current study it was seen that interatrial septum which formed from septum primum was not entirely closed and had small gaps in it at day 7 and these remained even till hatching.
Foramen ovale is a slit like opening in the atrial septum at the site of foramen secundum of the septum primum. The septum secundum surrounds the foramen secundum in a crescentic shape and leaves a slit-like opening which is covered in a valve like manner by the free edge of septum primum.