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ANATOMY / REFERENCE GALLERY1 / 1 reference
placenta: labelled anatomical figure. Original source colours and labels retained.
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Chorionic villi

Locate chorionic villi 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.

placenta: labelled anatomical figure. Original source colours and labels retained.

Image: OpenStax / University of Hawaiʻi adapted teaching figures; original contributors credited at source · Source / original · CC BY 4.0 — figure credits at source

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

Placental exchange barrier

Membranes & placenta

Placental exchange barrier

STRUCTURE & FUNCTION

Understand what you see.

Permits regulated maternal–fetal exchange without a normal direct mixing of the two circulations.

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. Maternal blood occupies intervillous spaces
  2. Fetal blood remains in villous capillaries
  3. Barrier composition changes with gestation
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 (3)

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

  • Syncytiotrophoblast
  • Villous stroma
  • Fetal capillary endothelium
03 / VIVA PRACTICE

Think first. Then reveal.

Say your answer aloud before opening the suggested response.

01How do you identify placental exchange barrier?
SUGGESTED ANSWER

Maternal blood occupies intervillous spaces. Fetal blood remains in villous capillaries. Barrier composition changes with gestation.

02Does maternal blood normally enter umbilical vessels directly?
SUGGESTED ANSWER

No. Maternal and fetal blood are normally separated by the placental interface.

03Is the barrier absolutely impermeable?
SUGGESTED ANSWER

No. Many substances, antibodies and some pathogens can cross; permeability is selective and changes with development.

04Which structures should you point out on this reference?
SUGGESTED ANSWER

Syncytiotrophoblast; Villous stroma; Fetal capillary endothelium. Permits regulated maternal–fetal exchange without a normal direct mixing of the two circulations.

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.