Intercostal Space, Muscles and Nerves Flashcards
(27 cards)
What must the paired intercostal spaces each contain?
3 layers of intercostal muscles
An intercostal nerve
Posterior intercostal artery and vein
Anterior intercostal artery and vein
What does the number of each intercostal space accord with?
Accords with the number of the rib lying superior to it.
What can upper limb and back muscles which have attachment to the ribs act as?
Accessory respiratory muscles during forces inspiration and expiration.
When might accessory respiratory muscles be used?
Forced inspiration and expiration.
What are the layers of intercostal muscles in each intercostal space called?
External
Internal
Intimal/innermost
What is the most superficial intercostal muscle in each intercostal space called?
External intercostal muscle.
What is the intermediate intercostal muscle in each intercostal space called?
Internal intercostal muscle.
What is the deepest intercostal muscle in each intercostal space called?
Intimal/innermost intercostal muscle.
Where is the neuromuscular bundle located?
Between the internal and intimal intercostal muscles.
What is located between the internal and intimal intercostal muscles?
Neuromuscular bundle.
In what order is the neuromuscular bundle comprised?
VAN (Vein, artery, nerve) from superior to inferior.
What are the most superior and inferior aspects of the neuromuscular bundle?
Vein is most superior, nerve is most inferior.
What acts as an indent to protect the function of the neuromuscular bundle?
Costal groove.
What does the costal groove do?
Acts as an indent to protect the function of the neuromuscular bundle.
Do the external and internal intercostal muscles occupy the entire length of the intercostal space?
No- they become aponeurotic at one end called the intercostal membrane.
How do the external and internal intercostal muscles form the intercostal membrane?
Become aponeurotic at one end when they don’t occupy the entire length of the intercostal space.
How much of the intercostal space do the innermost intercostal muscles fill?
The central half - the other half is completed anteriorly by the transverses thoracic muscles and subcostalis muscles posteriorly.
What is the rest of the intercostal space filled with anteriorly?
Transversus thoracis muscles.
What is the rest of the intercostal muscle filled with posteriorly?
Subcostalis muscles.
What is the function of the intercostal muscles?
Contribute to respiratory movements and assist in preventing the lungs and pleura from ballooning out during these movements.
What does each structure forming the intercostal neurovascular bundle in a particular intercostal space form?
Gives off a small collateral branch which is located just above the top of each rib.
What is given off from each structure forming the intercostal neuromuscular bundle?
Small collateral branches located just above the top of each rib.
Where are the small collateral branches located?
Just above the top of each rib.
What is the normal position of a chest drain?
5th intercostal space in the midaxillary line.
