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external intercostals location
most superficial layer - form V shape bilaterally between bottom of one rib to rib below
accessory muscles of inspiration
serratus anterior, pec major, pec minor, upper trap, levator scapulae, SCM, scalenes, rhomboids, serratus posterior superior, levator costarum
internal intercostals location
between ribs deep and oriented at a right angle to external intercostals, continuous with internal obliques
accessory muscles of expiration
rectus abdominus, external obliques, internal obliques, transversus thoracis, serratus posterior inferior, quadratus lumborum
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