FB2026_03 , released September 17, 2026
CV Term Report
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Term yolk sac membrane ID (Ontology) FBbt:00005376 (Fly Anatomy)
Definition Cellular envelope that surrounds the yolk mass in the center of the syncytial blastoderm embryo at the end of blastoderm stage. It contains the yolk granules, yolk cells (vitellophages) and some remnants of egg cytoplasm. At the end of stage 5, the cytoplasm of the yolk sac and the one from peripheral blastoderm cells are connected via wide cytoplasmic bridges.[ FlyBase:FBrf0064779 FlyBase:FBrf0089570 FlyBase:FBrf0174479 ]
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embryo
 |__blastoderm embryo_________
anatomical structure          |
 |__extraembryonic structure__|
 |__cell component____________|
                              yolk sac membrane  5 rec.
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Is a extraembryonic structure
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Part of blastoderm embryo
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