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11.03: Zone P1 – Superior Anterior Cheek

YOUR ASSIGNMENT FOR THIS LESSON

✅ Step #1: Review all content below.

✅ Step #2: Image the P1 zone on your own with your ultrasound, and using the checklist provided on this page, check off all key structures to be identified in this location

TRANSDUCER POSITION AT P1

Note: Clip has been sped up

STANDARD C1 ORIENTATION:
TRANSVERSE

Intersection of Horizontal line from P5 to midpupillary vertical line is the location of P1.

QUICK TIP
  • First identify the periosteum. Then glide to a portion where the periosteal line is discontinuous. This is the infraorbital foramen.
    • You can confirm this by turning on doppler and identifying arterial flow above the foramen.
    • A hypoechoic region just above the foramen will correspond with the LLS / LAO muscles. Differentiating these muscles apart can be very challenging under ultrasound.
  • If you have difficulty identifying the foramen, angulate the probe in the superior direction. The foramen is slightly angulated inferiorly and by angulating your probe you will visualize it more optimally.