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
Pneumotaxic center and apneustic center make up the
pontine centers
Inspiratory and expiratory center make up the
medullary centers
