semispinalis thoracis (muscle)
sem·i·spi·na·lis tho·ra·cis (mus·cle)[TA]
origin, transverse processes of fifth to eleventh thoracic vertebrae; insertion, spinous processes of first four thoracic and fifth and seventh cervical vertebrae; action, extends vertebral column; nerve supply, dorsal primary rami of cervical and thoracic spinal nerves.
Synonym(s): musculus semispinalis thoracis [TA], musculus semispinalis dorsi, semispinal muscle of thorax
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