Serratus
PSS origin
SP C7-T3
external intercostal nerve innervation
thoracic nerve
levator costarum action
rib elevator
insertion
central tendon
PIS orign
SP T12-L3
internal intercostal nerve innervation
thoracic
subcostales and transverse thoracis nerve innervation
related intercostal nerve
action
draw central tendon down
increase thoracic volume
SA actions
rib elevation when scapula fixed
scapula upward rot, abd, depression
maintains medial border of scapula
origin and insertion of both
EI rib above --> below
II rib below --> above
levator costarum origination + insertion
tp of all thoracic vertebrae --> rib below
origination
xiphoid process
lower 6 ribs
L 1-3