nerves and plexuses Flashcards
Where does the left recurrent larygeaneal nerve loop?
under the aortic arch
then it ascends to the neck
Where does the right recurrent larygeneal nerve loop?
under subclavian artery
then it ascend through the neck
Where does the phrenic nerve originate?
C3-5
where dos the phrenic nerve enter the thorax?
between the subclavian artery and vein
Where does the right phrenic nerve travel after entering the thorax?
along the SVC
Where does the left phrenic nerve travel after entering the thorax?
crosses the aortic arch left to the vagus nerve
where does the phrenic nerve terminate?
diaphragm
provides motor signals for diaphragm
What does the phrenic nerve provide somatosensory pathways for?
parietal pericardium
parietal pleura
Where does the right vagus nerve enter the thorax?
between the brachiocephalic trunk and right brachiocephalic vein descends along the trachea to posterior side of lung root into the esophageal plexus
Where does the left vagus nerve enter the thorax?
deep to the left brachiocephalic vein
between the left common carotid artery and the subclavian artery. crosses aortic arch gives off the left recurrent larygeanal nerve
coyrses to the left pulmonary artery to lung root
What are the two main plexuses for the superior mediastinum?
superior cardiac plexus
deep cardiac plexus
Where is the superior cardiac plexus found?
underlying the aortic arch
Where is the deep cardiac plexus found?
in front of the trachea bifurcation
above the division of the pulmonary artery
posterior to aortic arch
What is the sympathetic chain?
post ganglionic axons from the sympathetic chain (T1-T4) passes through the superior mediastinum and goes to the heart
Where does the preganglionic nerves from T5-T12
to the abdomen as the sphlancnic nerve
What are the parasympathetic nerves of the superior cardiac plexus?
cervical cardiac branch of vagus nerve
What are the sympathetic nerves of the superior cardiac plexus?
left upper cervical ganglion
What are the parasympathetic nerves of the deep cardiac plexus?
right vagus nerve: upper & lower cervical cardiac branches
left vagus nerve: superior cervical cardiac branch (recurrent larygeneal nerve)
What are the sympathetic nerves of the deep cardiac plexus?
Cervical sympathetic ganglia: middle and inferior on the left and all three on the right
Thoracic sympathetic chain: upper five or six thoracic of both sides
