Pronunciation (lon-GIS-I-mus SER-vi-Kus) Origin/Proximal Attachment Transverse processes of thoracic vertebrae T1 to T5 Insertion/Distal Attachment Transverse processes of cervical vertebrae C2-6 Action/Relevance Extends & laterally flexes vertebral column Innervation Lower cervical & upper thoracic nerves | 
