spinalis thoracis

noun
spinalis tho·ra·cis | \-thə-ˈrā-səs \

Medical Definition of spinalis thoracis 

: an upward continuation of the sacrospinalis that is situated medially to and blends with the longissimus thoracis, arises from the spinous processes of the first two lumbar and last two thoracic vertebrae, and inserts into the spinous processes of the upper thoracic vertebrae

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