| Term | Definition |
|
Serratus dorsalis superior |
Origin - First nine ribs. Insertion - Mid-dorsal raphe. Action - Draws ribs crainially. |
|
Serratus dorsalis inferior |
Origin - Last four ribs. Insertion - Lumbar spinous process. Action - Draws ribs crainially. |
|
Spinalis dorsi |
Origin - Last four thoracic vertebrae. Insertion - Thoraco-cervical vertebrae. Action - Extends vertebral column. |
|
Longissimus dorsi |
Origin - Sacral and caudal vertebrae. Insertion - Trunk and cervical vertebrae. Action - Extends vertebral column. |
|
iliocostalis |
Origin - As separate muscle bundles from lower thoracic ribs. Insertion - Three ribs craniad to the origin of each bundle. Action - Draws ribs together. |
|
Multifidus spinae |
Origin - As separate muscle bundles from lumbar transverse processes. Insertion - On spinous process one vertebrae craniad to origin of each bundle. Action - Extends from vertebrae column. |