Quizlet Comparative Anatomy - Cat - Muscles - Thoracic - Deep

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  1. External intercostal: Origin - Border of rib. Insertion - Border of adjacent rib. Action - Protracts the ribs.
  2. Internal intercostal: Origin - Border of rib. Insertion - Border of adjacent rib. Action - Retracts the ribs.
  3. Levator scapulae: Origin - Last five cervical vertebrae. Insertion - medial surface of scapula. Action - Draws scapula cranioventrally.
  4. Scalenus: Origin - Ribs. Insertion - Cervical transverse process. Action - Flexes the neck.
  5. Serratus ventralis: Origin - First ten ribs. Insertion - Medial surface of scapula. Action - Draws scapula to thorax.
  6. Transversus costarum: Origin - Lateral border of sternum. Insertion - First rib. Action - Draws sternum crainially.