Serratus posterior superior PA (Origin)
by a thin aponeurosis to the C7‐T3 Spinous processes & their supraspinous ligs.

Serratus posterior superior DA (Innervation)
Ribs 2‐5 along their superior border, external surfaces lateral to their angles

Serratus posterior superior innervation
Anterior rami of upper thoracic nerves T2‐5

Serratus posterior superior blood supply
Posterior branches of the posterior intercostal arteries

Serratus posterior superior actions
Action:elevates the ribs 2‐5

Serratus posterior inferior PA (Origin)
by a thin aponeurosis to the T11‐L2 Spinous processes & their supraspinous ligs.

Serratus posterior inferior DA (Insertion)
Ribs 9‐12 along their inferior borders, external surfaces anterolateral to their angles

Serratus posterior inferior innervation
Anterior rami of lower thoracic nerves T9‐12

Serratus posterior inferior blood supply
Posterior branches of the posterior intercostal arteries

Serratus posterior inferior actions
Action:depresses the ribs 9‐12