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5.04: Zone F2 – Inferior Midline Forehead

YOUR ASSIGNMENT FOR THIS LESSON

✅ Step #1: Review all content below.

✅ Step #2: Image the F2 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 F2

Play Video

STANDARD F2 ORIENTATION:
TRANSVERSE

Locate this zone by first locating F1 and F3. The halfway point between F1 and F3 on the midline is F2.

QUICK TIP
  • Once you become comfortable with the forehead zones, many clinicians scan directly from F1 to F3, passing through F2 and noting its anatomy without removing the probe from the patient's skin.
  • You want to continue to keep your scanning depth shallow here to maximize your image resolution and not waste your screen. The tissue thickness here is very shallow!

EXAMPLE OF IMAGE ACQUIRED AT F2

Srandard image acquired at F2. See key below for lables.*

ANATOMICAL LEGEND FOR F2 LOCATION

*Standard image acquired at F2 labeled with key anatomical structures.

KEY VESSELS IMAGED AT F2

Key vascular anatomy at F2 is the paracentral and supratrochlear a.

DOPPLER IMAGE ACQUIRED AT F2 OF KEY VESSELS

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QUICK TIP
  • Compared to F1, the vessels at F2 may be seen deeper. In this general vicinity, the supratrochlear artery will transverse the frontalis, running from deep to superficial as it courses superiorly along the forehead.
  • The vessels are generally easier to image at F2 than F1. To optimize your chances of identifying these vessels, you should:
    • Use lots of gel and minimize pressure with the probe.
    • Use as shallow a depth of penetration as possible to optimize the frequency at which you are scanning.
  • The vessels here are usually small. This means they are easily occluded and only seen at high frequencies.
  • Despite F2 being easier to image vessels compared to F1, it can still be very hard and sometimes simply impossible to image vessels at F2. If you do see vessels here, then it is helpful clinical information. It does not preclude their presence in the region being imaged if you do not see them.

DO IT YOURSELF CHECKLIST

Structures to Identify on Ultrasound for F2

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