spinalis thoracis (muscle)

spi·na·lis tho·ra·cis (mus·cle)

[TA] 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], musculus spinalis dorsi, spinal muscle of thorax