What muscles contract during inspiration?

Muscles contracting during inspiration:

1. Diaphragm:

- Primary muscle responsible for inspiration.

- Contracts and flattens, increasing thoracic volume.

2. External intercostal muscles:

- Located between ribs.

- Contract to elevate the ribs and increase thoracic volume.

3. Accessory inspiratory muscles:

- Only contract during deep inspiration or respiratory distress.

- Include sternocleidomastoid, scalenes, and pectoralis minor muscles.

Other Muscles involved in deep breathing:

4. Serratus posterior inferior:

- Supports and stabilizes the ribcage during deep breathing.

5. Quadratus lumborum:

- Assists diaphragmatic breathing.