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L1:
CRANIAL:
Where the axillary vessels cross lateral edge of pectoral minor
CAUDAL:
Pectoral major insert into ribs
ANT:
Pectoralis major and minor
POST:
Subscapularis muscle
LAT:
Imaginary line
between pectoral major and deltoid / latissiumus dorsi
MEDIAL:
Lateral border pectoral minor
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