Axial (trunk) Muscles and Epaxial Muscles and Muscles of the Back (Intermediate)

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Trunk: innervated by spinal nerves (dorsal rami and ventral rami) Epaxial: Innervated by dorsal rami of spinal nerves

Last updated 2:03 AM on 3/28/26
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6 Terms

1
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Epaxial Muscles

innervated by dorsal rami

2
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Hypaxial Muscles

innervated by ventral rami

Prevertebral

Lateral

Ventral

3
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Splenius Group

superior 1/3 of the back/neck

4
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Erector Spinae Group

inferior 2/3

Lateral-most

Iliocostalis

Longissimus

Spinalis

Medial-most

5
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Serratus Posterior Superior

elevates ribs for inspiration. This muscle is hidden on the models as it is deep to the rhomboids muscle group

6
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Serratus Posterior Inferior

depresses ribs for expiration