Interior

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Interior Conductive System of the Heart
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The Heart The walls of the heart are composed
of cardiac muscle. Out inward are epicardium,
myocardium endocardium
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The Heart Is slightly larger than a clenched
fist, working as double self-adjusting muscular
pump.
a. Human heart has four chambers 2 Atria 2
Ventricles b. The atria lie above are
separated from the ventricles by the
atrioventricular groove/septum c. The atria are
separated from each other by interatrial groove
ventricles by interventricular groove septum
Left Right
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• Interior of right atrium
• Sulcus terminalis
• a vertical groove on the outer side of heart at
  the junction b/w right atrium auricle
• d.Crista terminalis
• inside the forms a ridge
• c. Smooth posterior part main part Sinus Vinosus
• d. Rough anterior part
• musculi pactinati or pectinate muscles

Crista terminalis
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Openings into the Right Atrium

• SVC
• IVC
• Coronary sinus
• Right atrioventricular
• valve
• Many small veins

Fetal remnants

• Fossa ovalis
• Anulus ovalis
• Rudimentary valve of IVC

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• Interior of right ventricle
• Is a triangular chamber
• Upper part becomes funnel shaped
• Infudubulum
• C.Trabeculae carneae projecting ridges from the
  ventricular walls
• composed of 3 types
• i) papillary muscle attached with
  ventricular walls and apices are connected by
  fibrous chords
• (chordae tendineae) to cusps of the
  tricuspid valve

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ii) Attached two the ventricular walls without
the middle part e.g. moderator band iii) Simply
the prominent ridges.
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• Openings/valves in the right ventricle
• Tricuspid valve
• Anterior, Septal, inferior cusps
• the bases of cusps are attached to fibrous ring
• of the skeleton of the heart
• free tips thru Chordae tendineae to the
• papillary muscles. During the ventricular
• contraction prevent the regurgitation of blood
• b. Pulmonary valve
• Guards the pulmonary orifice
• consists of 3 semilunar cusps

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Right semilunar cusps
Anterior semilunar cusps
Left semilunar cusps
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• Interior of left atrium
• The interior of the left atrium is smooth
• Left auricle possess ridges

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Openings into the Left Atrium

• Four Pulmonary veins
• Left atrioventricular orifice
• guarded by bicuspid Mitral valve

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• Interior of Left Ventricle
• The cavity s circular
• Intraventricular BP is 6 times higher than RV
  
• Well-developed trabeculae carneae, papillary
  muscles but no moderate bands like right
  ventricle
• Walls are 3 times thicker
• than right ventricle

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Openings into the Left Ventricle

• Bicuspid atrioventricular (Mitral) valve
• Consists of two cusps (ant post)
• Similar to tricuspid valve
• Tricuspid Aortic valve
• Similar to the pulmonary valve
• with right, left posterior cusps
• behind each cusp aortic wall bulges

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Skeleton of the heart Consists of fibrous
rings That surround the atrioventricular,
Pulmonary aortic orifices The fibrous rings
support the bases of the cusps prevent the
valves from stretching becoming incompetent
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Conductive system of the heart
Sinoatrial (SA) Node Located in the wall right
atrium near the opening of the SVC
Internodal Conduction Paths
Atrioventricular (AV) Node Located in the atrial
septum near the coronary sinus
Atrioventricular Bundle Bundle of HIS Connects
the myocardium of atria ventricles
Left Right bundle branches
Purkinje fiber
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Thank you