- Spinous process of the vertebrae T6-T12
- Thoracolumbar Fascia
- Iliac crest
- Lower ribs (inferior 3rd and 4th)
- Extension of the Humerus (arms straight or bent)
- Antagonist with Pec Major when medially rotated and adduction of the humerus and also in depression of the scapula (i.e upward motion of push ups.
- Synergist with Pec minor in depression of Scapula