Origin: xiphoid process, lower ribs
Insertion: Central tendon
- Contractions cause muscle to flatten and increases volume of thoracic cavity
- Inspiration
- Origin and Insertion: intercostal space
- Contractions increase volume of thoracic cavity
- Runs ventral to caudal.
- Used in strenuous exercise
- Expiration
- Origin and insertion: intercostal space
- Contraction decrease volume of thoracic cavity
- Runs ventral to cranial.
- Used in strenuous exercise