spinalis

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noun

spi·​na·​lis spī-ˈnā-ləs  spi-ˈna-lis 

plural spinales -(ˌ)lēz 

: the most medial division of the sacrospinalis situated next to the spinal column and acting to extend it or any of the three muscles making up this division:

a

: spinalis thoracis

b

: spinalis cervicis

c

: spinalis capitis

spinalis

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see medulla spinalis