ANAT 215 Lecture Notes - Lecture 19: Interatrial Septum, Coronary Sinus, Coronary Circulation
28 Apr 2018
School
Department
Course
Professor
ANAT 215 week 7 lecture 1
Cardiovascular sys- heart
Function
Moves blood t/out body, heart acts as pump forcing blood thru blood vessels which transport blood allowing exchange of
nutrients and waste
Heart
location
mediastinum
Medial cavity, lies and slightly rotated to L
Apex and
base
Posterior surface attached to several large vessels terminating into apex, apex touches chest wall b/n 5-6th ribs,
inferior border lies on diaphragm
Coverings
of the
heart
Pericardium
Visceral epicardium and parietal pericardium part of serous
Serous and
fibrous
Simple squamous + prod serous fluid for lubrication
dense irregular CT forms pericardial sac
Pericardial
cavity and
fluid
lubricates, reduces friction of heart against other structure in
mediastinum
Heart
chambers
L+ R atrium
and auricle
Function= receiving chambers, little contractility activity means walls are thin
Interatrial septum: sep atria
Atrioventricular groove: aka coronary sulcus, encircle the junction b/n atrium
and ventricles, contain coronary blood vessels
Pectinate muscles: anterior R atrium
Fossa ovalis: shallow depression, marks spot where foramen ovale existed
L + R
ventricles
Function= discharging chambers, pumps of heart, R ventricles pump blood to
lungs, L vent pumps into aorta, rough inflow tract to prevent swoosh but
smooth outflow for minimal resistance
Interventricular septum: sep ventricles
Interventricular sulcus: sep L and R ventricles
Trabeculae carneae: irregular ridges on internal walls, fewer in L ventricle due
to auricle formation
Papillary muscle: project into vent chambers, keep valves taught, moderator
band causes pap muscles to contract before vent
Heart
valves
tricuspid
R AV, prevent backflow into atrium when ventricles contract, 3 flexible cusps
(endocardium supported by CT)
bicuspid
L AV/ mitral, 2 flaps
Chordae
tendinae
Collagen cords attached to valves, anchor cusps to papillary muscles which
contract before vent closing the valves, prevents prolapse
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Function moves blood t/out body, heart acts as pump forcing blood thru blood vessels which transport blood allowing exchange of nutrients and waste mediastinum medial cavity, lies and slightly rotated to l. Posterior surface attached to several large vessels terminating into apex, apex touches chest wall b/n 5-6th ribs, inferior border lies on diaphragm. Visceral epicardium and parietal pericardium part of serous. Simple squamous + prod serous fluid for lubrication dense irregular ct forms pericardial sac lubricates, reduces friction of heart against other structure in mediastinum. Function= receiving chambers, little contractility activity means walls are thin. Atrioventricular groove: aka coronary sulcus, encircle the junction b/n atrium and ventricles, contain coronary blood vessels. Fossa ovalis: shallow depression, marks spot where foramen ovale existed. Function= discharging chambers, pumps of heart, r ventricles pump blood to lungs, l vent pumps into aorta, rough inflow tract to prevent swoosh but smooth outflow for minimal resistance.
