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9.05: Zone C3 – Superior Medial Region

YOUR ASSIGNMENT FOR THIS LESSON

✅ Step #1: Review all content below.

✅ Step #2: Image the C3 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 C3

STANDARD C3 ORIENTATION:
TRANSVERSE & LONGITUDINAL

The intersection of the vertical line from medial canthus to the horizontal line from the superior alar groove is the location of C3.

QUICK TIP
  • Like the other zones that involve the nose, use a lot of gel in this area. By filling the contour between the nose and cheek with gel you will capture better images and be able to apply less pressure which will maintain optimal visualization of the underlying anatomy.
  • Identify the periosteum of the maxillary bone, then identify two hypoechoic bands in both the longitudinal and transverse positions. These bands will correspond to the LLSAN muscle and LLS muscle.

EXAMPLE OF TRANSVERSE IMAGE ACQUIRED AT C3

Standard image acquired at C3. (Transverse | Left side is patient's midline). See key below for lables.*

ANATOMICAL LEGEND FOR C3 LOCATION IN TRANSVERSE

*Standard image acquired at C3 labeled with key anatomical structures.

EXAMPLE OF LONGITUDINAL IMAGE ACQUIRED AT C3

Standard image acquired at C3. (Longitudinal | Left side is deep). See key below for lables.*

ANATOMICAL LEGEND FOR C3 LOCATION IN LONGITUDINAL

*Standard image acquired at C3 labeled with key anatomical structures.
Superficial Fat Compartments
Deep Fat Compartments

KEY VESSELS IN THE REGION

DOPPLER IMAGES ACQUIRED AT C3 OF KEY VESSELS

Play Video
QUICK TIP
  • The angular artery lives up to its name and travels in an angular direction. Angulating your probe where the superior aspect is more medial in the longitudinal position will allow you to see a bigger slice of the angular artery simultaneously. 

DO IT YOURSELF CHECKLIST

Structures to Identify on Ultrasound for C3

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