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Pectoralis minor

Contents

Anatomy

Position

  • Deep

Origin

  • 3.-5. ribs

Insertion

  • Processus coracoideus scapulae

Main function

  • Scapula
    • Protraction
    • Depression
  • 3.-5. ribs
    • Elevation

Secondary function

  • Scapula
    • Downward rotation

Nerve innervation

  • Segmental: C5-Th1
  • PeripheralMedial and lateral pectoral nerves

Arterial supply

  • Pectoral branches of the thoracoacromialstem
  • Posterior intercostal artery
  • Lateral thorocal artery

Referred pain pattern

Symptoms

  • Mimicing cardiac pain
  • Entrapment of nerve or blood vessels when reaching overhead or sleeping with arms overhead

Muscle attachment zones

Videos

Short version

Detailed version

MyoFascial lines

Deep ventral arm line

Synergists

Protraction scapula

  • Serratus Anterior
  • Pectoralis Major

Depression scapula

  • Trapezius (lower)
  • Latissimus Dorsi
  • Pectoralis Major
  • Serratus Anterior

Antagonists

Retraction scapula

  • Trapezius
  • Rhomboideus Major and Minor
  • Levator Scapulae

Elevation scapula

  • Trapezius (upper)
  • Levator Scapulae
  • Rhomboideus Major and Minor
  • Serratus Anterior
  • Pectoralis Major