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7.03: Zone O1 – Lateral Canthus

YOUR ASSIGNMENT FOR THIS LESSON

✅ Step #1: Review all content below.

✅ Step #2: Image the O1 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 O1

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STANDARD O1 ORIENTATION:
TRANSVERSE & LONGITUDINAL

The margin of the boney orbital rim at the level of the lateral canthus is the position of O1.

QUICK TIP
  • Find the bone of the orbital rim first to verify your position, then adjust depth accordingly. In this position, 1-2cm is often more than enough depth of penetration. 

EXAMPLE OF TRANSVERSE IMAGE ACQUIRED AT O1

Standard image acquired at O1. Left O1 Position (Transverse | Left side is patient medial). See key below for lables.*

ANATOMICAL LEGEND FOR O1 LOCATION IN TRANSVERSE

*Standard image acquired at O1 labeled with key anatomical structures.

EXAMPLE OF LONGITUDINAL IMAGE ACQUIRED AT O1

Standard image acquired at O1. Left O1 Position (Longitudinal | Top of image is patient superior, right of image is deep). See key below for lables.*

ANATOMICAL LEGEND FOR O1 LOCATION IN LONGITUDINAL

*Standard image acquired at O1 labeled with key anatomical structures.

DOPPLER IMAGES ACQUIRED AT O1 OF KEY VESSELS

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QUICK TIP
  • The vessels in this area are small, do not be surprised if you have trouble identifying any. To optimize your chances turn your doppler sensitivity to 2cm/s.
  • If you move directly superior from O1 you will encounter the sentinel vein deep to the orbicularis oculi muscle.

DO IT YOURSELF CHECKLIST

Structures to Identify on Ultrasound for O1

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