intercostal muscles Flashcards
intercostal muscles
- external intercostal muscle
- internal intercostal muscle
- innermost intercostal muscle
- subcostalis muscle
- sternocostalis muscle
ext. muscle origin
outer border of costal groove on lower border of the rib
ext. muscle insertion
upper border of the rib below
ext. muscle extension
tubercle of the rib> costochondral junction
ext. intercostal muscle continues ant. as
external intercostal membrane
ext. intercostal muscle’s direction
downward & forward
int. intercostal muscle origin
floor of costal groove on the lower border of the rib
int. intercostal muscle insertion
upper border of the rib below
int. intercostal muscle extension
sternum > angle of the rib
int. intercostal muscle continues post. as
posterior (internal) intercostal membrane
int. intercostal muscle’s direction
downward & backward
innermost intercostal origin
inner border of costal groove on lower border of the rib
innermost intercostal insertion
upper border of the rib below
innermost intercostal extension
middle 2/4 of intercostal space
innermost intercostal’s direction
downward & backward
subcostalis muscle function
connects inner surfaces of the ribs
sternocostalis muscle function
connects ribs to sternum
intercostal muscles function
deep forced respiratory functions
main muscle of respiration
diaphragm
neurovascular plane of thorax
*lies between internal intercostal and innermost intercostal muscle
* contents: post. intercostal vein
post. intercostal artery
intercostal nerve
