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Orbicularis oculi: magnified reference view with a numbered learning marker. The complete original plate is available in the next view.
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Orbicularis oculi

Circular muscle around the eyelids and orbit. Orbital and palpebral portions can be distinguished. Part of the facial-expression group.

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

Orbicularis oculi: magnified reference view with a numbered learning marker. The complete original plate is available in the next view.

Image: OpenStax College · Source / original · CC BY 4.0

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

Orbicularis oculi

Face & scalp muscles

Orbicularis oculi

STRUCTURE & FUNCTION

Understand what you see.

Circular muscle around the eyelids and orbit.

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. Circular muscle around the eyelids and orbit
  2. Orbital and palpebral portions can be distinguished
  3. Part of the facial-expression group
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.

  • Orbital part
  • Palpebral part
  • Medial palpebral region
03 / VIVA PRACTICE

Think first. Then reveal.

Say your answer aloud before opening the suggested response.

Examiner-style prompts: identify the structure, explain its relations, then answer the applied follow-up. These are revision questions, not authenticated past papers.

01Identify orbicularis oculi and justify your identification.
SUGGESTED ANSWER

Circular muscle around the eyelids and orbit. Orbital and palpebral portions can be distinguished. Part of the facial-expression group.

02What is its motor supply?
SUGGESTED ANSWER

Facial nerve VII.

03What can happen if eyelid closure is weak?
SUGGESTED ANSWER

Incomplete closure can expose the cornea; orbicularis oculi closes the eyelids rather than opening them.

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.