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10.07: Zone M5 – Inferior-Posterior of Mental Tubercle

YOUR ASSIGNMENT FOR THIS LESSON

✅ Step #1: Review all content below.

✅ Step #2: Image the M4 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 M5

Note: Clip is sped up.

STANDARD M5 ORIENTATION:
TRANSVERSE

The location at the midline immediately inferior and posterior to the mental tubercle is the location of M4.

QUICK TIP
  • First, identify the mandible as the deep hyperechoic bony line. The tissue here is often very shallow, and you may need less than 1cm of penetration.
  • Next, identify a hypoechoic region just superficial to the mandible. At M5 this is the platysma muscle.

EXAMPLE OF TRANSVERSE IMAGE ACQUIRED AT M5

Standard image acquired at M5. (Transverse | Acquired on midline). See key below for lables.*

ANATOMICAL LEGEND FOR M5 LOCATION IN TRANSVERSE

*Standard image acquired at M5 labeled with key anatomical structures.

KEY VESSELS IN THE REGION

DOPPLER IMAGES ACQUIRED AT M5 OF KEY VESSELS

Play Video
QUICK TIP
  • At M5 you will be looking for the submental artery just above the platysma muscle.
  • This vessel may be small and have slow flow, adjust your doppler sensitivity to 1cm/sec if you are having difficulty identifying it. Also use lots of gel and very light pressure with the probe to avoid inadvertently compressing the vessel.

DO IT YOURSELF CHECKLIST

Structures to Identify on Ultrasound for M5

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