Thoracic Cavity - Heart Flashcards
What is this structure?
The Heart
Heart
Blood supply to this structure
Coronary arteries
Heart
Innervation to this structure
- Vagus nerve (parasympathetic);
- Thoracic sympathetic trunk T1-T4 (sympathetic),
- Sensation pathways: unconcious/reflex (vagus)
- Pain (sympathetic)
- Contains intrinsic nervous system to control cardiac muscle contractions (SA Node, AV node and fibers)
Heart
What is this structure?
Right Atrium
Right Atrium
Blood Supply to this structure
Right Coronary Artery
Right Atrium
Innervation through this structure
- Posterior wall of right atrium contains the SA node,
- Inferior part near interventricular septum contains AV node, which transmits signals from SA node to cardiac
muscles to propagate contraction
Right Atrium
What is this structure?
Fossa Ovalis
Fossa Ovalis
What is this structure?
Opening of Coronary sinus
Coronary Sinus
Function of this structure
Returns venous blood from the coronary circulation to the right atrium
Coronary Sinus
What is this structure?
Right Auricle
Right Auricle
Function of this structure
Outpocketing of the muscular part of the atrium that surrounds great vessels
Right Auricle
What is this structure?
Pectinate muscles
Pectinate muscles
Function of this structure
- Strips of muscles that project off crista terminalis
- Demarcates muscular part of the right atrium
Pectinate muscles
What is this structure?
Crista terminalis
Crista terminalis
Function of this structure
- Smooth ridge where pectinate muscles come off
- Lies at junction between smooth part and muscular part of the right atrium
Crista terminalis
What is this structure?
Right atrioventricular (tricuspid)
valve
Right atrioventricular (tricuspid) valve
Function of this structure
Regulates bloodflow between the right atrium and right ventricle
Right atrioventricular (tricuspid) valve
What is this structure?
Right Ventricle
Right Ventricle
Blood flow to structure
Right Coronary Artery
Right Ventricle
Function of this structure
Receives blood from the right atrium, pumps blood into the pulmonary trunk to lungs
Right Ventricle
What is this structure?
Interventricular septum
Interventricular septum
Blood flow to structure
- Anterior 3/4 from anterior interventricular artery (LAD)
- Posterior 1/4 typically from posterior interventricular artery
Interventricular septum
Function of structure
Divides left and right ventricles
Interventricular septum
What is this structure?
Right ventricle papillary muscles
(Anterior, Septal, Posterior)
Right ventricle papillary muscles
Function of this structure
- Contracts to maintain AV valve sufficiency to prevent backflow of blood during ventricular contraction
- Attached to the right AV valve via tendons called chordae tendinae
Right ventricle papillary muscles
What is this structure?
Septomarginal trabecula (moderator band)
Septomarginal trabecula
Function of this structure
- Transmits nervous impulses to anterior papillary muscle from interventricular septum
- Coordinates papillary muscle contraction
Septomarginal trabecula
What is this structure?
Trabeculae carneae (right)
Trabeculae carneae (right)
Function of structure
Projections of ventricular muscle into the lumen
Trabeculae carneae (right)
What is this structure?
Right semilunar valve (pulmonic valve)
Right semilunar valve
Function of structure
Prevents backflow of blood to the right ventricle
Right semilunar valve
What is this structure?
Left Atrium
Left Atrium
Function of structure
Receives oxygenated venous blood from the lungs, pumps blood to left ventricle
Left Atrium
Blood flow to structure
Left coronary artery
Left Atrium
What is this structure?
Left Auricle
Left Auricle
Function of this structure
- Outpocketing of the muscular part of the atrium
- Projection of the atrium that surrounds great vessles
Left Auricle
What is this structure?
Left atrioventricular (bicuspid or mitral) valve
Left atrioventricular valve
Function of structure
- Regulates bloodflow between the left atrium and left ventricle
- Has 2 valve leaflets
Left atrioventricular valve/Mitral
What is this structure?
Left ventricle
Left ventricle
Function of structure
Receives blood from the left atrium, pumps blood into the aorta to systemic circulation
Left ventricle
Blood flow to structure
Left coronary artery
Left ventricle
What are these structures?
Left ventricle papillary muscles (anterior,posterior)
Left ventricle papillary muscles
Function of structures
- Contracts to maintain av valve sufficiency to prevent backflow of blood during ventricular contraction
- Attached to the left AV valve via tendons called chordae tendinae
Left ventricle papillary muscles
What is this structure?
Trabeculae carneae (left)
Trabeculae carneae (left)
What is this structure?
Left semilunar valve (aortic valve)
Left semilunar valve
Function of structure
- Prevents backflow of blood to the left ventricle
- Just distal to the valve leaflets are the openings of the coronary arteries
Left semilunar valve
