yogabook / muscles / autochthonous back muscles / spinalis thoracis
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M. spinalis thoracis
Origin: spinous processes of the last two thoracic vertebrae and first two lumbar vertebrae
Attachment: spinous processes of the second to eighth thoracic vertebrae
Antagonists:
Movement: Innervated on both sides: Extension of the spine; innervated on one side: Support of an already assumed ipsilateral lateral flexion or elimination of a contralateral lateral flexion.