 Openings in the right atrium

Right Atrial & Ventricular Chambers

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the purpose of publication and general circulation.

aijazahmedkhan7@live.com

Objectives

 Recall- External features of right atrium Brief develop. aspect & foetal circulation

 Openings in the right atrium

 Features of right atrial chamber

 Location of SA & AV nodes

 Features of right ventricular chamber

 Papillary muscles

 Moderator band

 Features of inflow & outflow tracts.

 Applied aspect

Fate of

sinusvenosu

s

Interatrial

septum

Foetal

circulation

Before birth

Human Circulation

After birth

Right Atrium – internal features



Sinus venarum [smooth]



Atrium proper [rough]



Crista terminalis



Musculi pectinati



Openings of large & small veins



Tricuspid opening – outlet



Fossa ovalis & its limbus



SA & AV node



Triangle of Koch [AV node]



Tendon of Todaro [part of fibrous skeleton]



Intervenous tubercle



Torus aorticus [bulges of non- coronary sinus]



Valves – of IVC & Coronary sinus



Foramina venarum minimarum

Internal Structure of Right Atrium

Triangle of Koch, defined ^by

Tendon of Todaro, Orifice of coronary sinus

& Septal cusp

Interior of right ventricle

 Inflow tract

 Supraventricular crest

 Trabeculae carnae: ridges, bridges, papillary m

 Papillary muscles: ant., post, sept.

 Chordae tendineae: true & false

 Outflow tract/infudibulum/conus

 Moderator band [septomarginal]

 Pulmonary [semilunar] valve: 1 post & 2

anterior cusps

1:Brachiocephalic Trunk;

2:Superior Vena Cava; 4:Right Auricle; 5:Right Atrium; 6:Aortic Valve;

8:Tricuspid Valve; 9:Papillary

Muscles; 10:Myocardium of Right Ventricle;

11:Left Common Carotid Artery;

12:Left Subclavian Artery;

13:Aortic Arch;

14:Ligamentum Arteriosum;

17:Pulmonary Vein; 18:Pulmonary Trunk; 19:Left Auricle;

20:Pulmonic Semilunar Valve;

21:Papillary Muscles;

22:Myocardium of Left Ventricle;

23:Papillary Muscles;

24:Interventricular Septum; 

Explanatory: Right Heart

Tricuspid [RAV ] valvular complex

 Atrioventricular orifice

 Annulus of tricuspid

 Cusps (ant., post., & sept.), surface features

 Chordae tendineae

 Papillary muscles: name, attachments &

functions

Trifoliate, tricuspid, 3 fingers,

11cm, functionally bicuspid

Septa & Orifices of

Heart

Tricuspid valve : Cusps & Papillary muscles

Atrial & Ventricular aspect of the Cusps.

Attachment of chordae tendinae

Pulmonary Orifice & Semilunar Valves

Cusps

- Posterior

- Right anterior

- Left anterior

Opened Rt. Ventricle

PULMONARY Valve

Rt. & Lt. ant.

cusps

Aorta

PT

Semilunar Valves of Aorta & Pulmonary trunk are alike

Tricuspid orifice

SOME APPLIED ASPECT

 Heart Sounds: lub-dub

 Developmental defects

 Diseases affecting valves –

stenosis/prolapse

First & Second Heart Sound [lub - dub]

Sound is produced by closure of valves

Septum primum defect Septum secundum

defect

Patent foramen ovale Inferventricular setum defect

Congenital

Anomalies

Patent Foramen Ovale

Congenital

Anomalies

Diseases of Heart Valves

D

the purpose of publication and general circulation.

aijazahmedkhan7@live.com

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