Rotatores muscles
Musculi rotatores
Definition
The rotators muscles are long and short muscle bundles deep to the multifidi muscles in cranial thoracic region.
Rotatares Longi
Origin: Medial surface of the multifidus muscle.
Insertion: From the transverse processes of the tenth to the first thoracic vertebrae.
Action: Rotation of the greater cranial portion of the thoracic vertebral column about the longitudinal axis in unilateral action; otherwise, fixation.
Nerve: Medial branches of the rami dorsales of the thoracic nerves.
Rotatares Brevis
Origin: Medial surface of the multifidus muscle.
Insertion: Spinous processes of the first through tenth thoracic vertebrae.
Action: Rotation of the greater cranial portion of the thoracic vertebral column about the longitudinal axis in unilateral action; otherwise, fixation.
Nerve: Medial branches of the rami dorsales of the thoracic nerves
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