U2 day 4 Flashcards
Boundaries of thoracic wall
ant: sternum/costal cartilage(s)
lat: ribs
post: ribs and thoracic vertebrae
inf: respiratory diaphragm
sup: open
Fnx: protection of thoracic viscera and abdominal viscera as well as support
Blood supply in thoracic cavity (arterys)
post. intercostal aorta and anterior intercostal aorta with anastomosis between them, they drain into aorta
vein supply in thoracic cavity
ant. intercostal vein and post. intercostal vein drain inro azygous vein, which drains into sup. vena cava
intercostal nerve innervation
Because there is no networking, intercostal vein is the same as thoracic spinal n. and ventral rami
Costal Grove
the grove on the rib bones that the vessels and nerves rest
Thoracic cavity
x2 Pulmonary cavities
X1 Mediastinum
mediastinum space
has heart, trachea, esophagus, thymus, vagus, sympathetic trunk
pulmonary cavity
lungs (right has 3 lobes, left has 2 lobes)
blood supply of lungs
separate blood supply and Venus return and connective tissue for each lobe, because they are segmented
airways
trachea, primary bronchus, secondary bronchi, tertiary bronchi, alveoli
Serous membrane
in lungs - pleura
in heart - pericardium
in abdominal - peritoneum
lung movement
don’t move themselves, thoracic cavity pulls on lungs and negative pressure sucks air into lungs
Respiration
need to create vacuum, by expanding the thoracic wall
phenothorax
causes collapsed lung, something that removes the negative pressure around the lung, so it doesn’t inflate.
respiratory diaphragm
skeletal muscle.
inn: phrenic nerve
ax: elevate ribs superiorly and expand laterally.
Responsible for 60% of quiet breathing, when contracted volume increases in pulm cavity, but pressure decreases so air is sucked in.
