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Scatter: Comparative Anatomy - Cat - Muscles - Back

Longissimus dorsi
Origin - Sacral and caudal vertebrae. Insertion - Trunk and cervical vertebrae. Action - Extends vertebral column.
Spinalis dorsi
Origin - Last four thoracic vertebrae. Insertion - Thoraco-cervical vertebrae. Action - Extends vertebral column.
Serratus dorsalis inferior
Origin - Last four ribs. Insertion - Lumbar spinous process. Action - Draws ribs crainially.
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.
Serratus dorsalis superior
Origin - First nine ribs. Insertion - Mid-dorsal raphe. Action - Draws ribs crainially.

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Longissimus dorsiOrigin - Sacral and caudal vertebrae. Insertion - Trunk and cervical vertebrae. Action - Extends vertebral column.
Multifidus spinaeOrigin - 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.
Serratus dorsalis inferiorOrigin - Last four ribs. Insertion - Lumbar spinous process. Action - Draws ribs crainially.
Serratus dorsalis superiorOrigin - First nine ribs. Insertion - Mid-dorsal raphe. Action - Draws ribs crainially.
Spinalis dorsiOrigin - Last four thoracic vertebrae. Insertion - Thoraco-cervical vertebrae. Action - Extends vertebral column.
iliocostalisOrigin - As separate muscle bundles from lower thoracic ribs. Insertion - Three ribs craniad to the origin of each bundle. Action - Draws ribs together.
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