A group of muscles in the back originating near the sacrum and extends vertically up the length of the back. It lies on each side of the vertebral column. It's function is to straighten the back and provides side to side rotation.
Includes:
- Splenius Capitis
- Splenius Cervicis
- Semispinalis Capitis
- Spinalis Group (Cervicis and Thoracis)
- Longissimus Group (Capitis, Cervicis, Thoracis)
- Iliocostalis Group ( Cervicis, Thoracis. Lumborum)
Splenius Capitis
Origin: Spinous processes of lower C-Spine and upper T-Spine
Insertion: Mastoid process, base of skull, upper cervical vertebrae
Action: Two sides act together to extend the neck (bilateral action); alone the rotate and laterally flex the head to that side
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| Splenius Capitis Muscle |
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| Spinous Process |
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| Mastoid Process |
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| Insertion of Splenius Capitis |
Splenius Cervicis
Origin: Spinous process of T3-T6
Insertion: Transverse process of C1-C6
Action: Bilateral action: extends and hyperextends head and neck; unilateral action: laterally flexes and rotates head and neck to same side
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| Splenius Cervicis |
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| Origin/Insertion Splenius Cervicis |
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