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There are three intermediate intrinsic back muscles the iliocostalis, longissimus and spinalis.
The transversospinalis muscle group is the deep layer of the intrinsic back muscles .
The semispinalis muscle belongs to the transversospinalis muscles .
The axial connective tissue system is a fiber continuum of the lung that maintains alveolar surface area during changes in lung volume.
The axial connective tissue system is a fiber continuum of the lung that maintains alveolar surface area during changes in lung volume.
Human Skeleton with arteries
The erector spinae or spinal erectors is a set of muscles that straighten and rotate the back .

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The upper back muscles are: Latissimus dorsi, Rhomboid muscles, Levator scapulae and the Trapezius .

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