Coelomic Body Cavities Flashcards
coelom
a fluid-filled cavity found in most animals, located within the mesoderm
coelomic cavity
a potential space in a closed/collapsed “sac” of mesothelium containing only serous fluids in the normal condition
divisions of the coelom
initially a single cavity, subsequently divides into pleural cavities, a pericardial cavity, and a peritoneal cavity
body sacs are composed of mesothelial cells
pleural cavity
the space between the two layers of mesothelium that surrounds the lungs, filled with fluid that lubricates the expansion o fthe lungs
pericardial cavity
an empty space that envelops the heart, containing only serous fluid
function of the coelom
allows the internal organs to shift around and move independently of the body wall, creating more physiological and evolutionary innovation that enabled the existence of large, complex and higly mobile animals
development of the diaphragm
separates the pleural and peritoneal cavieis as it develops
the septum transversum forms most of the central tendon in the adult, and muscular ingrowths from the body wall forms lateral parts of the diaphragm in the adult
parietal pleura
where the coelomic lining is reflected onto the posterior, lateral, and anterior body walls
very sensitive to pain because it receives innervation from the somatic nerves of the boy wall
mesothelioma
a malignancy of mesothelial derived tissues and may affect the pleura, peritoneum, or pericardium
pleuropericardial folds
separates the pleural cavities as these structures grow
thoracic cavity
anatomic space, not coelom derived but houses the pleural and pericardial coelom-derived cavities
mediastinum
contains the pericardium/heart, great vessels, trachea, esophagus, and some key nerves
If solid material is aspirated, which direction will it go?
to the right branch of the trachea
phrenic nerves
C3, C4, and C5 - found within the pleuropericardial fold and innervates the diaphragm
