hello everyone this is dr fox let's talk about the pleurae
as you may recall the thoracic cavity is divided into three spaces laterally we have right and
left pulmonary cavities and between the two pulmonary cavities we have the mediastinum
now each pulmonary cavity is going to surround a lung and a serosal membrane
that surrounds that lung that serous membrane is called a pleura and there are two components to it
there's a visceral pleura that visceral pleura is what adheres to the organ in this case the lung
and then there's the parietal pleura which is going to line all of the surfaces
which comprise that pulmonary cavity so thinking about them the ribs and intercostal spaces
are going to form much of the outward in particular anterior lateral and posterior surfaces
of that pulmonary cavity and so they are lined by costal pleura the medial surface of
that cavity is the mediastinum and so that is lined by mediastinal pleura
the inferior boundary of the pulmonary cavities is the diaphragm and so that is covered by
diaphragmatic pleura and then there's a region above the thoracic inlet so above the plane of
rib one which has a little cupula that that cupula is covered by cervical pleura and recall that
in in some nomenclatures the cervical pleura is nothing more than where the
costal pleura meets the mediastinal pleura now let's take a look at some of these regions in a
in a more enhanced way so along this surface would be the costal pleura we can see so that's costal
surface of the lung would be visceral pleura here we can see the pericardium reflected away and and
so lining this superficial portion would be the mediastinal pleura we can see the phrenic nerve
descending down through this space on its way down to meet the diaphragm which we can see here
so there's the right cupula of the diaphragm and so this would be the diaphragmatic pleura
and we've got a clavicle in the way here so seeing that cervical pleura is going to prove difficult
so let's take a couple of different views here
let's let's start on the left here and we can see just above the plane of the rib some of this
pleura there superior to the rib that would be the cervical pleura we can also see the
costal pleura reflected here and here that mediastinoplera has been removed as the
viscera has been removed and we can also see the diaphragmatic pleura covering the diaphragm
and on this view we can also see the phrenic nerves descending down to each hemidiaphragm so
uh we've discussed the pluri and the components of a pleura visceral which adheres to lungs
and parietal which adheres to the various surfaces which comprise the pulmonary cavity so
we'll have costal mediastinal diaphragmatic and cervical pleura thank you for your time