Diaphragm Muscle Anatomy

Diaphragm Muscle

Origin: Attaches to the xiphoid process, the inner surface of the lower six costal cartilages and to the L1 through the L3 lumbar vertebrae
Insertion: Attaches to the central aponeurotic tendon
Actions: Inspiration and forced inspiration
Innervation: Phrenic nerve (C3, C4, C5)
Blood Supply: Pericardiacophrenic, Musculophrenic, Superior phrenic, and Inferior phrenic arteries

Primary Actions of the Diaphragm

1. Inspiration

Agonists:

  • External Intercostals
  • Serratus Posterior Superior

Antagonists:

  • Internal Intercostals
  • Transversus Thoracis
  • Internal Oblique
  • External Oblique
  • Rectus Abdominis

2. Forced Inspiration

  Agonists:

  • Pectoralis Minor
  • Pectoralis Major
  • External Intercostals
  • Scalenes
  • Serratus Posterior Superior

  Antagonists:

  • Internal Intercostals
  • Transversus Thoracis
  • Internal Oblique
  • External Oblique
  • Rectus Abdominis

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