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L3:
CRANIAL:
Cranial subclavian artery or pectoral minor insert on coracoid (RTOG).
Where the subclavian artery passes the line between clavicle-1st rib (PROCAB)
CAUDAL:
Where the axillary vessels cross the medial edge of pectoral minor
ANT:
Pectoralis major
POST:
Ribs and intercostal muscles
LAT:
Medial border pectoral minor
MEDIAL:
The junction of subclavian and internal jugular veins
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