spinalis thoracis muscle

spi·na·lis tho·ra·cis mus·cle

(spī-nā'lis thō-rā'sis mŭs'ĕl)
Origin, spinous processes of upper lumbar and two lower thoracic vertebrae; insertion, spinous processes of middle and upper thoracic vertebrae; action, supports and extends vertebral column; nerve supply, dorsal primary rami of thoracic and upper lumbar.
Synonym(s): musculus spinalis thoracis [TA] .