They are very thin-walled membranes, very poor in blood-vessels, formed by the bulged-out pleural or peritoneal covering of the lungs, through the parabronchial tubes of which they are filled with air.
Pig, Pleural ganglion.
In some cases each pleural ganglion is connected with the opposite branch of the visceral commissure by anastomosis with the pallial nerve, a condition which is called dialyneury; or there may be a direct connective from the pleural ganglion to the visceral ganglion of the opposite side, which is called zygoneury.
The connexion with the pericardium of pl, Pleural ganglion.
O, o, Right and left olfactory ce.pl, The cerebro-pleural conganglia and osphradia re nective.