Anatomy Flashcards
3 main important shunts in foetal circulation
ductus venosus (shunts oxygenated blood from umbillical vein to IVC to bypass liver)
foramen ovale (shunt oxygenated blood from right to left atrium)
ductus arteriosius (shunts deoxygenated blood from pulmonary artery to inferior aorta)
how do the shunts in the foetal circulation change on birth
when they take their first breath, this decreases pulmonary resistance – increases left atrial pressure = closure of foramen ovale
increase in 02 from respiration + reduced prostalandins from placental separation = closes ductus arteriosus
post natal derivative of umbillical vein
round ligament (ligamentum teres hepatis)
post natal derivative of umbilical arteries
medial umbilical ligament
what layers does the pericardial space lie
between the parietal pericardium and epicardium
what neve supplies the pericardium
phrenic nerve
why does pericarditis cause referred pain to the shoulders
its supplied by the phrenic nerve
damage to what artery causes heart block or arrythmias and why
right coronary artery as it supplies the SA and AV node