Flashcards in Lymphatics and Misc. of Heart Deck (26):
What lymphatic vessels drain the heart?
subepicardial lymphatic plexus to the tracheobronchial node
What is the contractile mechanism that the heart relies on to beat rhythmically?
When is a nerve supply necessary for the heart?
to alter the rate of beating
What does the sympathetics do to the heart?
increases heart rate and strength of contraction, dilates the coronary arteries
What does the parasympathetics do to the heart?
decreases heart rate and strength of contraction, constricts the coronary arteries
What innervates the heart?
What makes up the cardiac plexus?
The superficial cardiac plexus (beneath the aortic arch and anterior to the pulmonary trunk)
Deep cardiac plexus (posterior to the arch of the aorta)
What is the sympathetic innervation to the heart from?
cervical and thoracic cardiac nerves from sympathetic trunk (T1-4)
What is the parasympathetic innervation to the heart from?
Where are subluxations and related soft tissue changes restricted to that are associated with myocardial infarctions?
Impingements on the sympathetics from T1-T4 can allow what?
parasympathetic activation to dominate, which leads to constriction of the coronary arteries
What is the conduction system?
specialized muscle fibers that control the rhythmic beating of the heart
What is the natural pace maker of the heart that is located at the upper end of the crista terminalis, near the junction of the right atrium with the superior vena cava?
What is located in the septal wall above the opening for the coronary sinus in the right atrium?
What does the atrioventricular bundle contain?
right bundle (enters septomarginal trabecula of the right ventricle)
left bundle branch (enters papillary muscles of the left ventricle)
What is joined by branches of the left and right bundle branches?
subendocardial plexus of conduction cells
Where does the conduction impulse begin?
Where does the conduction impulse go after the sinuatrial node?
atrial wall to the atrioventricular node
After the atrioventricular node where does the conduction impulse go?
through the atrioventricular bundle and its branches to the subendocardial plexus of conduction cells
After the conduction impulse reaches the subendocardial plexus of conduction cells where does it go?
Throught the myocardium of ventricles
What are the great vessels that exit the heart?
aorta and pulmonary trunk
What does the pulmonary trunks branches?
left and right pulmonary arteries
What are the great vessels that enter the heart?
pulmonary vein, superior and inferior vena cavas
What is the remnant of the embryonic ductus arteriosis that connects the arch of the aorta to the left pulmonary artery or trunk?
What hooks under the aortic arch posterior to the ligamentum arteriosum?
left recurrent laryngeal nerve