semispinalis thoracis

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

Medical Definition of semispinalis thoracis 

: a deep longitudinal muscle of the back that arises from the transverse processes of the lower five thoracic vertebrae, is inserted into the spinous processes of the upper four thoracic and lower two cervical vertebrae, and with the semispinalis cervicis acts to extend the spinal column and rotate it toward the opposite side

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occurring twice a year or every two years

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