Intercostal muscles Flashcards
Where are the intercostal muscles located?
Between the ribs
Which muscles are superficial?
The external intercostals
What type of intercostals are most deep?
the innermost intercostals
How many sets of each are there?
11
What supplies the intercostals with blood?
The intercostal arteries
Where does the blood vessels and nerves lie?
between the innermost intercostals and the internal intercostals in the intercostal space. At the lower border of each rib
How do the fibres in the external intercostals run?
obliquely anteroinferior (diagonally forward and down)
Contraction of the external intercostals causes what?
pulls ribs up and out
How do the fibres in internal intercostals run?
Obliquely posteroinferior (diagonally backwards and down)
Describe the innermost intercostals
They are incomplete and variable. They run obliquely posteroinferior (backwards and down). Serperated from internals by the collateral branches
What are some accessory muscles of respiration?
sternocleidomastoid, pectoralis minor and the scalenes.
What are the quiet breathing muscles
Just diaphragm
What are the inspiratory forced breathing muscles?
Accessory muscles and external intercostals
What are the forced breathing expiratory muscles?
Abdominal muscles and internal intercostals
