L16 Flashcards
what is contained in the thoracic cavity?
mediastinum: heart, vessels, pericardium
pleural cavities
what type of cartilage is costal joints?
hyaline cartilage
what are the three joints which connects the sternum to the ribs
sternocostal
costochondral
interchondral
what type of joint is sternocostal
1st: cartil
synovial
what type of joint is chostochondral
cart
what type of joint is interchondral
synovial
what are the two articulations between thoracic vertbrae and ribs and what kind of joint are they
costotransverse
costovertebral
synovial
what are the two primary muscles needed for respiration?
diaphragm and intercostals
what is the diaphragm
sheet of skeletal muscle which seperates thorax from abdomen
what is the shape of dia when relaxed and contracted
relaxed:dome
contract:flat
explain the action of diaphragm
contraction expands thoracic cavity, compresses abdominoplelvic cavity
function of intercostal muscles?
lifts and depresses ribcage
what does external intercostals do?
lift ribcage
what does internal intercostals do?
depress ribcage
what happens during quiet inspiration?
diaphragm contracts, flattens
external intercostals contracts, lifts
what happens during quiet expiration? and forced?
diaphragm relaxes, domes
external intercostal relax, no longer lifts
forced: internal intercostal contract, depress
how are the lungs able to expand as the cavity does?
pleura makes lungs stick to thoracic wall
what are the 3 pleuras?
visceral, parietal, pleural fluid
what is visceral pleura?
on lungs
what is parietal pleura
on thoracic wall
what is plerual fluid?
in between two pleuras for frictionless movement and bonds lungs to thoracic wall
