semispinalis thoracis muscle

sem·i·spi·nal·is tho·ra·cis mu·scle

(sem'ē-spī-nā'lis thō-rā'sis mŭs'ĕl)
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] .
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