Boundaries of Nodal Levels

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  1. Boundaries of Level I nodes:
    • Above hyoid bone
    • Below mylohyoid muscle
    • Anterior to a traverse line drawn through the posterior edge of the SMG

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  2. Boundaries of Level IA nodes:
    • Between medial margins of anterior bellies of the digastric muscles
    • (Former name: Submental nodes)


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  3. Boundaries of Level IB nodes:
    • Posterior and lateral the medial edge of the anterior belly of the digastric muscle
    • Anterior to the posterior edge of the SMG
    • (Former name: Submandibular nodes)

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  4. Boundaries of Level II nodes:
    • From skull base to the lower body of the hyoid bone
    • Anterior to the posterior edge of of the SCM
    • Posterior to the posterior edge of the SMG

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  5. Boundaries of Level IIA nodes:
    • Anterior, lateral, or medial to the IJV
    • OR lie posterior to the IJV and are inseparable from it
    • (Former name: Upper internal jugular nodes)

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  6. Boundaries of Level IIB nodes:
    • Lie posterior to the IJV and have a fat plane separating the nodes and the vein
    • (Former name: Upper spinal accessory nodes)

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  7. Boundaries of Level III nodes:
    • Between the lower body of the hyoid bone and the lower margin of the cricoid arch
    • Anterior to the posterior edge of the SCM
    • Lateral to the medial margin of the CCA/ICA
    • (Former name: Mid-jugular nodes)

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  8. Boundaries of Level IV nodes:
    • Between the lower margin of the cricoid cartilage arch and the level of the clavicle
    • Anterior and medial to an oblique line drawn between the posterior edge of the SCM and the posterolateral edge of the anterior scalene muscle
    • Lateral to the medial margin of the CCA
    • (Former name: Low jugular nodes)

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  9. Boundaries of Level V nodes:
    • From the skull base at the posterior border of the attachment of the SCM to the clavicle
    • Anterior to the anterior edge of the trapezius muscle
    • Posterior to the posterior edge of the SCM (skull base to bottom of cricoid)
    • OR posterior and lateral to an oblique line through the posterior edge of the SCM and the posterolateral edge of the anterior scalene muscle (bottom of cricoid to clavicle)

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  10. Boundaries of Level VA nodes:
    • From skull base superiorly to lower margin of cricoid cartilage inferiorly
    • (Former name: Upper posterior cervical nodes)

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  11. Boundaries of Level VB nodes:
    • From lower margin of cricoid cartilage to level of clavicle
    • (Former name: Lower posterior cervical nodes)

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  12. Boundaries of Level VI nodes:
    • Inferior to the body of hyoid, superior to the top of manubrium
    • Between the medial margins of the ICAs/CCAs
    • (Former name: Visceral nodes)

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  13. Boundaries of Level VII nodes:
    • Caudal to the top of the manubrium in the superior mediastinum
    • Between the medial margins of the left and right common carotid arteries
    • Superior to the innominate vein
    • (Former name: Superior mediastinal)

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Author:
anders
ID:
315490
Card Set:
Boundaries of Nodal Levels
Updated:
2016-02-07 17:05:19
Tags:
ENT boards nodes anatomy
Folders:
ENT
Description:
Descriptions of levels I - VII of the neck nodes with pictures
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