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

Air spaces in frontal, ethmoid, sphenoid and maxillary bones. Communicate with nasal cavity. Their size and development vary.

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

Paranasal sinuses: 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.

Paranasal sinuses

Nose, orbit & palate

Paranasal sinuses

STRUCTURE & FUNCTION

Understand what you see.

Air spaces in frontal, ethmoid, sphenoid and maxillary bones.

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. Air spaces in frontal, ethmoid, sphenoid and maxillary bones
  2. Communicate with nasal cavity
  3. Their size and development vary
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 (4)

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

  • Frontal sinus
  • Maxillary sinus
  • Ethmoidal cells
  • Sphenoid sinus
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 paranasal sinuses and justify your identification.
SUGGESTED ANSWER

Air spaces in frontal, ethmoid, sphenoid and maxillary bones. Communicate with nasal cavity. Their size and development vary.

02Where does the sphenoid sinus open?
SUGGESTED ANSWER

Into the sphenoethmoidal recess.

03Why is a maxillary sinus relevant to upper molar procedures?
SUGGESTED ANSWER

Upper posterior tooth roots may be closely related to its floor, with variable intervening bone.

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.