11.3--Muscle Groups
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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Splenius Capitus | O: Ligamentum nuchae and spinous processes
I: Occipital bone and mastoid process of temporal bone
A: Acting together, exten head, lateral flexion and rotation of head
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Splenius Cervicis | O: Spinous process
I: Transverse process of C
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Erector Spinae | Iliocostalis muscles, longissimus muscles, and spinalis muscles
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Iliocostalis Cervicis | O: Ribs 1-6
I: Transverse processes of C4-C6
A: Maintain posture; lateral flexion
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Iliocostalis Thoracis | O: Ribs 7-12
I: Ribs 1-6
A: Smae as before
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Iliocostalis Lumborum | O: Iliac crest
I: Ribs 7-12
A: Same as above
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Longissimus Capitis | Same as in Neck muscles
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Longissimus Cervicis | O: T4-5
I: C2-C6
A: Extend vertebral column, and lateral flexion individually
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Longissimus Thoracis | O: Transverse Process of lumbar
I: Transverse Process of Thoracic and Superior Lumbar vertebrae
A: Extend vertebral column, and single lateral flexion
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Spinalis Capitis | Same as before
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Spinalis Cervicis | O: Ligamentum Nuchae
I: Spinous process of axis
A: Extension of vertebral column in respective region
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Spinalis Thoracis | O: Spinous process of C7
I: Spinous process of superior thoracic vertebrae
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Multifidus | O: Sacrum, ilium, transverse processes of lumbar, thoracic and cervical
I: Spinous process of more superior vertebra
A: Act together, extend vertebral column, lateral flexion
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Rotatores | O: Transverse processes of all vertebrae
I: Spinous process of vertebra superior to origin
A: Act together, weakly rotate vertebral column to side opposite contracting muscle
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Interspinales | O: Superior surface of all spinous processes
I: Inferior surface
Action: Extension of vertebral column
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Intertransversaril | O: Transverse processes of all vertebrae
I: Transverse process of vertebra superior to origin
A: Act together, weakly extending column, flexing column and stabilizing it
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Anterior, Middle, Posterior Scalene | Elevate ribs during inhalation
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