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7.04: Zone O2 – Inferior Lateral Orbit

YOUR ASSIGNMENT FOR THIS LESSON

✅ Step #1: Review all content below.

✅ Step #2: Image the O2 zone on your own with your ultrasond, and using the checklist provided on this page, check off all key structures to be identified in this location

TRANSDUCER POSITION AT O2

STANDARD O2 ORIENTATION:
TRANSVERSE

The intersection between the horizontal line from O3 to the vertical line at O1 is the O2 position.

QUICK TIP
  • Locate the zygomatic bone first to determine your optimal depth of imaging. 
  • The most superficial continuous hypoechoic line will be the obicularis oculi muscle. Deep to this will be the SOOF at O2.
  • A hypoechoic structure deep to the obicularis oculi at O2 is the zygomaticus minor muscle.

EXAMPLE OF IMAGE ACQUIRED AT O2

Standard image acquired at O2. Left O2 Position (Transverse | Left side is patient medial). See key below for lables.*

ANATOMICAL LEGEND FOR O2 LOCATION IN TRANSVERSE

*Standard image acquired at O2 labeled with key anatomical structures.

DOPPLER IMAGES ACQUIRED AT O2 OF KEY VESSELS

Play Video
QUICK TIP
  • Out of all the areas we will image in the face, the O2 is one of the areas most void of key vessels. The vessels you will see here will primarily be periorbital veins. The largest being the inferior palpebral vein.
    • We are dealing with veins here, flow velocity will be slow, turn your doppler to 2cm/s or use power doppler to identify these vessels. 

DO IT YOURSELF CHECKLIST

Structures to Identify on Ultrasound for O2

Once you have completed this checklist, mark this part of the lesson as complete.