Cord of brachial plexus are named as per their relation with the axillary aery behind which muscle?

Pectoralis minor crosses in front of axillary aery and divides it into three pas. The anterior relation of each pa are; First pa lies behing the pectoralis major muscle, second pa lies behind the pectoralis minor and major muscle and third pa lies behind pectoralis major. The cords of brachial plexus are named according to their relation with the second pa of axillary aery, lateral cord runs lateral to the axillary aery, as well the medial and posterior cord lies medially and posterior to the axillary aery. Thus the muscle anteriorly to second pa is pectoralis minor and major.