Nerve innervation of the lung Flashcards
parasympathetic nervous nerves arise from what nerve?
vagus nerve
The main respiratory muscles are the
diaphragm, intercostals, and abdominals
The diaphragm is the major____ and is innervated by the___ that lie in the cervical cord (C3-C5 in humans)
- major inspiratory muscle
-innervated by the phrenic motor neurons
What would be the result if a person sustained a spinal cord injury at
the C3 and C4 level?
Their respiration would be severely compromised and would most
likely need a respirator.
What happens if phrenic nerve is damaged?
Can’t breathe
Breathing has a what type of components?
-Voluntary & involuntary
Where is the respiratory center located?
-Medulla Oblongata and pons, in the brainstem
The respiratory center is made up of _____major groups of neurons, two in the____, and one in he_____
3
medulla
pons
In the pons, the pontine respiratory group includes two areas known as the
- pneumotaxic center and apneustic center
Medullary centers:
Inspiratory center
Expiratory Center
Pontine Centers
pneumotaxic center
Apneustic center
The Respiratory Centers of the Medulla exists as paired centers which set the pace of respiration. Each pair has 2 groups. What are they?
-Dorsal Respiratory Group (DRG) and a
-Ventral Respiratory Group (VRG)
What does each DRG control? What is it active with?
-Each DRG controls the diaphragm and external intercostals
-Active with both quiet and forced breathing
Each VRG work only with forced expiration. What muscles does it include?
forced expiration
- internal intercostals & accessory muscles
What muscles for inspiration does each VRG’s inspiratory center control
accessory
