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Bilaminar embryonic disc: labelled teaching diagram. Original labels and colours retained.
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Epiblast

Locate epiblast on this anatomical reference. Read the original plate labels to confirm the view and adjacent structures.

Zoom in, then drag to inspect. Keyboard: + / − to zoom, arrows to pan, 0 to reset. Tap the numbered markers to explore parts.

Bilaminar embryonic disc: labelled teaching diagram. Original labels and colours retained.

Image: OpenStax College / university open textbook · Source / original · CC BY 4.0

Numbered markers and focused views are Mediveerse learning overlays; the original reference is linked above.

Bilaminar embryonic disc

Early development

Bilaminar embryonic disc

STRUCTURE & FUNCTION

Understand what you see.

Establishes the arrangement preceding gastrulation.

Zoom into the original labels. Practise pointing out each structure, then explain it aloud. Diagrams are teaching references; specimen appearance and slide staining vary.

01 / IDENTIFICATION

How to recognise it.

  1. Epiblast and hypoblast form two layers
  2. Amniotic cavity lies on the epiblast side
  3. Yolk sac lies on the hypoblast side
02 / KEY STRUCTURES

Point them out.

Tap a number to open its reference, zoom in and locate the structure. Numbers stay the same across views. This key follows landmarks visible in the reference images.

Related features & study points (1)

Additional relations, attachments or microscopic details to revise alongside this plate. These are separate from its numbered image landmarks.

  • Yolk sac
03 / VIVA PRACTICE

Think first. Then reveal.

Say your answer aloud before opening the suggested response.

01How would you identify bilaminar embryonic disc?
SUGGESTED ANSWER

Epiblast and hypoblast form two layers. Amniotic cavity lies on the epiblast side. Yolk sac lies on the hypoblast side.

02Which layer gives rise to the three definitive germ layers?
SUGGESTED ANSWER

The epiblast. During gastrulation, migrating epiblast cells form definitive endoderm and mesoderm while remaining epiblast becomes ectoderm.

Read the references.

Credited anatomical plates, microscopy and university teaching references. Individual image credits appear below the viewer. Historical plates can use older terminology; use the lesson text for current names.