SERRATUS ANTERIOR
Origin
Upper eight ribs and ant intercostal membranes from midclavicular line. Lower four interdigitating with external oblique
Action
Lat rotates protracts scapula
Insertion
Inner med border scapula. 1 and 2: upper angle; 3 and 4: length of costal surface ; 5-8: inf angle
Nerve
Long thoracic N of Bell (C5, 6, 7) (from roots) slips from ribs 1 and 2: C5; 3 and 4: C6; 5-8: C7)
