heart 2 Flashcards
what is the name of the tubes in the beginning of heart development
endocardinal tubes into primitive heart tubes
what separates atrium when heart splits into chambers in heart development
septum primum
describe the path of bllod from placenta through the heart
- placenta
- umbilical vein
- ductus venosus
- inferior vena cava
- right atrium
- left artrium
- left ventricle
- aorta
what are the internal features of right artrium
openings: superior vena cava, inferior vena cava, coronary sinus, Right Atrioventricular (Tricuspid) Orifice
limbus of fossa ovale
right auricle
crista terminalus
Pectinate Muscles
SA mode (near the SVC opening)
AV node (near the coronary sinus opening)
what is the Pectinate Muscles
Parallel ridges of muscle found in the anterior wall and auricle, aiding in contraction.
what is the crista terminalis
A ridge that separates the smooth posterior part from the rough anterior part in right atrium
what are the internal features of right ventricle
openings: Pulmonary Orifice – Leads into the pulmonary trunk
Trabeculae Carneae
Papillary Muscles
Chordae Tendineae
Septomarginal Trabecula
infundibulum
what are trabeculae carneae
Irregular muscular ridges on the inner walls of right ventricle
what is the Septomarginal Trabecula
A muscular band that extends from the interventricular septum to the anterior papillary muscle, carrying part of the right bundle branch for electrical conduction.
what are Chordae Tendineae
Tendinous cords that connect the papillary muscles to the tricuspid valve,
what is the function of papillary muscles
prevent valve prolapse during contraction.
what internal features are in left atrium
left auricle
opening of four pulmonary veins
what are the internal features of the left ventricle
Trabeculae Carneae
thicker walls
external innervation of heart is from where
autonomic - efferents and afferents
what centre controls the parasympathetic system for heart
cardioinhibitiry center
what centre controls the sympathetic system for heart
cardioacceleratory center
what is the function of parasympathetic system in heart
slows SA node and conduction to AV node
what is the path of the conducting system in heart
SA node
indernodal pathway
AV node
left and right branches of bundle of his
purkinje fibers
where are purkinje fibers found
heart and cerebellum
