Anterior and Middle Mediastinum Flashcards
where does the right phrenic nerve go in relation to the heart
associate with the pericardium over the right atrium
where does the left phrenic nerve go in relation to the hear
associates with the pericardium over the left atrium and ventricle
what is fibrous pericardium
though connective tissue sac
what does the fibrous pericardium blend with superiorly
tunica adventitia of the great vessles
what is the fibrous pericardium also continuous with
central tendon of the diapghram
what forms the pericardial sac
fibrous pericardium
what are the order of the seroud pericardium
fibrous, parietal and visceral (epicardium)
what is relfected over the great vessels
fibrous pericardium as the epicardium
what is the pericardial cavity
space between the two layersof serous pericardium
what does fluid produced by the serous pericardium allow
help lubricate the movement of the heart
what is the msucle layer of the heart
myocardium
what is the linning of the chmabers of the heart called
endocardium
what is the base of the heart comprised moslty of
left atrium
what runs posterior to the ligamentum arteriosum
left recurrent laryngeal nerve
what does the SA nodal branch supply
sinautrial node within the wall of the right atrium
what does the small branches of the right coronary artery supply
small AV nodal branch to supply the AV node
what is another name for the branches of the anterioer interventricular artery
diagonal artery
what does the left main coronary artery supply
blood to the left side of the heart muscle
part of the right ventricle
AV bundle
IV septum
what does the right coronary artery supply
Right atrium and most of the Right ventircle
SA and AV node
IV septum
L ventricel
what most of the veisn drain to before returning to the right atirum
coronary sinus
what drains direlcty into the chmaber
anterior cardiac vien
what seperates the sinus venorum and the muscular wall of the right atrium
crista terminalis
what is the small thumb shaped depression on the left and right atrium
fossa ovalis
what is the fossa ovalis
remnant of the embryological foramen ovale (that allowed communication between the left and right atrium)
what is musculi pectinati
intenral muscular ridges generally on the anterolaterla surface of the chambers
what is the function of musculi pectinati
increase power without increasing heart mass
what is the smooth part of the right atrium
sinus venorum
what is the moderator band
unquie to the R ventricle
will carry part of the conducting system of the heart
what are the muscular ridges of right ventricle called
traceulae carnae
where are semilunar valves
pulmonary trunk and aorta
Where are cuspid valves found
atria and ventricle
what pressure is needed to close a semilunar and a cuspid
Semilunar - low pressure
cuspid - high
what is the function of the fibrous skeleton
provide support for the cuspid valve and the carnets
act as insulation
where is the SA node locatedq
the sinoatrial node is located in the upper part of the crista terminalis adjacent to the entry of the superior vena cava
what does the SNA node cause a contraction
Signals from the sinoatrial node will pass through the wall of the right atrium and extend into the wall of the left atrium, causing the atria to contract at the same time
how does the AT node send a singal down
The atrioventricular node is responsible for transmitting the signal from the SA node down to the ventricles, and it will do this via the atrial ventricular bundle which divides into right and left bundle branche
where is the atrioventricular node located
lower part of the interatrial septum
why does the singal travel to the moderator band
ensure the anterior papillary muscle and the anterior part of the wall on the right ventricle contract at the same time
what do theassay nodes also get
autonomic supply via the cardiac plexus
what is vagus nerve transmitted via
intrinstic ganglia
what spinal level will ti travel via
T1 to T5-6 via cervical and superioer throacic
