page_title: Septum primum
hierarchical_section_title: Septum primum
context_page_description: During heart development of a human embryo, the single primitive atrium becomes divided into right and left by a septum, the septum primum. The septum primum grows downward into the single atrium.
context_section_description: During heart development of a human embryo, the single primitive atrium becomes divided into right and left by a septum, the septum primum. The septum primum (from Latin, meaning 'first septum') grows downward into the single atrium.
caption: The developing human heart, at day 30. The septum primum (top middle) grows down to separate the primitive atrium into the left and right atrium of the human heart.
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