Accessory muscles

Definition

Accessory muscles are muscles that assist with breathing when the primary muscles of respiration are insufficient or require additional support. These include the sternocleidomastoid, scalene, and pectoralis minor muscles.

5 Must Know Facts For Your Next Test

1. Accessory muscle use is often a sign of respiratory distress or increased work of breathing.
2. Increased dependence on accessory muscles can indicate poor nutritional status affecting respiratory muscle function.
3. The sternocleidomastoid and scalene muscles elevate the rib cage to increase thoracic volume during inspiration.
4. Malnutrition can lead to muscle wasting, including accessory muscles, impairing effective breathing.
5. Nutritional interventions can help improve the strength and function of accessory muscles in patients with pulmonary conditions.

Review Questions

• What are accessory muscles and what role do they play in respiration?
• How can poor nutrition impact the function of accessory muscles?
• Name three specific accessory muscles involved in respiration.

Related terms

Diaphragm: The primary muscle used for inspiration, separating the thoracic cavity from the abdominal cavity.

Respiratory Distress: A condition where breathing is difficult and inadequate oxygen is being delivered to tissues.

Malnutrition:

A condition resulting from an imbalanced diet where nutrients are either insufficient or excessive, impacting overall health.