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Anatomy of heart
Screenshot_20210320_211849, MYOCARDIUM
middle layer…
Anatomy of heart
VENOUS DRAINAGE OF THE HEART
- Most blood from the heart wall drains into the right atrium through the coronary sinus, which lies in the posterior part of the Atrioventricular groove.
It is a continuation of the great cardiac vein.
- it opens into the right atrium to the left of the inferior vena cava
RIGHT CORONARY ARTERYBranches:
*Right marginal arteries
(acute marginal artery)
- posterior interventricular artery. (in post. 4th sulcus)
- sinoatrial nodal artery.
- Atrioventricular nodal artery
HEART WALL
PERICARDIUM
- Outer protective layer
composed of :
- visceral pericardium
- paricardial cavity
- parietal pericardium
ENDOCARDIUM
- deepest layer of the heart
- smooth lining to
reduce friction of blood flow
-
NERVE SUPPLY OF THE HEART
The heart is innervated by sympathetic and parasympathetic fibers of the autonomic nervous system via the cardiac plexuses situated below the arch of the aorta
:
THE HEART VALVES
ATRIOVENTRICULAR VALVES
separates the right atrium from
the right ventricle
Prevents backflow into atrium
Separates the left atrium from
the left ventricle.
Prevents backflow into atrium
SEMILUNAR VALVES
Separates the right ventricle from
the pulmonary arteries.
Prevents backflow after
ventricular contraction
Aortic valve
Separates the left ventricle
From the aorta.
Prevents backflow after
ventricular contraction
LEFT CORONARY ARTERY
Branches :
- *Left anterior descending (LAD) or anterior interventricular artery.
(lies in anterior 4 sulcus)
*septal branches
- diagonal branches
** Left marginal artery.
(obtuse marginal artery)
**Left circumflex artery.
MYOCARDIUM
- middle layer of the heart
- locations of muscle fibers
responsible for pumping
-