1.5e body cavities and membranes Flashcards
internal organs are housed within what?
enclosed spaces or cavities
body cavities are named according to what?
surrounding structures
what are body cavities grouped into?
posterior aspect and ventral cavity
posterior aspect
- completely encased in bone
* physically/developmentally distinct from ventral cavities
what is the posterior aspect subdivided into?
cranial cavity (endocranium)
which is formed by bones of cranium
-houses the brain
vertebral canal
formed by bones of vertebral column
-houses spinal cord
is the ventral cavity larger than posterior cavity? where is the ventral cavity placed?
the ventral cavity is larger than posterior cavity and it is placed anteriorly in the body
does the ventral cavity completely encase organs in bone?
no, the ventral cavity doesn’t completely encase organs in bone
what is the ventral cavity partitioned into?
- superior thoracic cavity
* inferior abdominopelvic cavity
the abdominopelvic cavity contains what?
abdominal cavity
pelvic cavity
what are the 3 things found in the thoracic cavity?
pleural cavity
pericardial cavity
mediastinum
what is the mediastinum and what does it contain?
the space in the thoracic cavity between the lungs or median space in thoracic cavity
contains heart, thymus, esophagus, trachea, and major blood vessels that connect to the heart
what does the thoracic diaphragm separate? what is the function of the thoracic diaphragm?
the abdominopelvic cavity and performs an important function in breathing
in the thoracic cavity, pleural cavities does what..
each houses a lung
what are the 2 spaces and structures within the abdominopelvic cavity? what do they contain?
abdominal cavity
(superior area)
*contains most of digestive system organs, kidneys, and most of ureters
pelvic cavity
(inferior area)
*contains distal part of large intestine, remainder of ureters and urinary bladder, & internal reproductive organs
subdivisions of ventral cavity are lined with..
serous membranes
how many layers of serous membranes are there? what are they?
2
parietal layer/visceral layer
parietal layer
lines internal surface of body wall
visceral layer
covers external surface of organs (viscera)
what is serous fluid? what does it act as? what does it reduce?
- liquid secreted by cells in serous membrane
- acts as a lubricant
- reduces friction caused by movement of organs against body wall
what are serous membranes arranged like? what does it represent?
serous membranes are arranged like fist in balloon
fist represents body organ
balloon represents serous membrane
what are the spaces and structures within the thoracic cavity?
(2 pericardium, 1 cavity)
pericardium
parietal pericardium, visceral pericardium, pericardial cavity
what is pericardium and how is it layered?
2 layered serous membrane
parietal pericardium
outer layer, which forms sac around the heart
visceral pericardium
forms the heart’s external surface
pericardial cavity
space between parietal and visceral layers containing serous fluid
what is pleura, how is it layered and what is it associated with?
2 layered serous membrane associated with lungs
parietal pleura
outer layer lines internal surface of thoracic wall
visceral pleura
inner layer covers external surface of lungs
pleural cavity
space between parietal and visceral layers containing serous fluid
relating to the abdominopelvic cavity, what is the peritoneum?
2 layered serous membrane lining the abdominopelvic cavity
parietal peritoneum
outer layer, which lines the internal walls of the abdominopelvic cavity
visceral peritoneum
inner layer, which covers the external surface of most abdominal and pelvic organs
peritoneal cavity
potential space between parietal and visceral layers containing serous fluid
