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Mnemonic

Shoulder Abduction Muscle Sequence

A memory aid for which muscles abduct the arm through each range.

Anatomy Upper Limb
Expansion

Supraspinatus 0 to 15 degrees, Deltoid 15 to 90 degrees, Trapezius and Serratus anterior 90 to 180 degrees

Expansion

  • 0 to 15 degrees - supraspinatus initiates abduction
  • 15 to 90 degrees - deltoid (middle fibres) takes over
  • 90 to 180 degrees - trapezius and serratus anterior rotate the scapula to lift the arm overhead