Quizlet Comparative Anatomy - Cat - Muscles - Back

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  1. iliocostalis: Origin - As separate muscle bundles from lower thoracic ribs. Insertion - Three ribs craniad to the origin of each bundle. Action - Draws ribs together.
  2. Longissimus dorsi: Origin - Sacral and caudal vertebrae. Insertion - Trunk and cervical vertebrae. Action - Extends vertebral column.
  3. 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.
  4. Serratus dorsalis inferior: Origin - Last four ribs. Insertion - Lumbar spinous process. Action - Draws ribs crainially.
  5. Serratus dorsalis superior: Origin - First nine ribs. Insertion - Mid-dorsal raphe. Action - Draws ribs crainially.
  6. Spinalis dorsi: Origin - Last four thoracic vertebrae. Insertion - Thoraco-cervical vertebrae. Action - Extends vertebral column.