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The erector spinae or spinal erectors is a set of muscles that straighten and rotate the back .
The muscles in the back are the trapezius, rhomboids, latissimus dorsi, erector spinae, multifidus, and quadratus lumborum.
The semispinalis muscle belongs to the transversospinalis muscles .
The extrinsic muscles include the trapezius, latissimus dorsi, rhomboid major and minor, levator scapulae, and the serratus posterior superior and inferior muscles .
There are three intermediate intrinsic back muscles the iliocostalis, longissimus and spinalis.
The splenius capitis is a deep muscle of the neck. .
Extensor carpi ulnaris is a fusiform muscle in the posterior forearm .

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The spinalis is a deep muscle of the back .

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