Heart 2 - Interior of the Heart

0:09 hello friends welcome to the viper was of anatomy today we see the interior of the heart in the previous video we have seen the external feature of the heart the link of it is given below today we discuss the interior of the heart now the heart is made up of a four chamber two atrium and the two ventricle here I had made one section through the heart in which it shows the right atrium left atrium right ventricle left ventricle it is made up of a fourth chamber today we discuss its interior of each chamber the first we start from the right atrium now

0:59 the right atrium it formed the part of astronomical surface the part of astra no costal surface the wall of the right water the right 1/3 of this as well as the part of upper border now the right atrium receives the opening of a superior vena cava and the inferior vena cava this is the superior vena cava this is the inferior vena cava so it receives the deoxygenated blood through the whole body by these two large green the superior vena cava and the inferior vena cava the right atrium it is elongated in the shape having the superior vena cava at its upper end and the inferior vena

1:45 cava at its lower end now its upper end here anteriorly it is elongated upper end is elongated which is known as a right oracle this is the right oracle okay now the interior of the right oracle you can see it is a spongy interior of a right oracle is a spongy which prevent the free flow of blood okay now externally here along the right border which is extending from the opening of the superior vena cava to the inferior vena cava here you can see this arrow vertical group thus a low vertical group which is known as a sulcus terminalis Salukis terminalis and it produced by the inner muscular reach you

2:32 can see here there's the in their muscular reach which is known as a krishna terminalis now in the upper part of a sulcus terminalis here we present the sinoatrial node which act as a pacemaker of heart the last thing externally the right atrium is separated from the right ventricle by the right anterior atrioventricular groove which lies vertically okay and it lodges the right coronary artery and the small cardiac Wade now we see the interior now the interior of a left atrium shows here I

3:19 have remove the interior wall of right atrium okay so this is the entire wall of a right atrium the interior shows the smooth posterior part of this one and the rough inferior part this one smooth posterior part is known as a sinus V Niram and the rough interior part is known as a packed init part or the atrium proper okay now these two are separated from each other by the muscular rate which is known as a krishna terminal now first we discuss the sinus wave in Ihram the sinus veneer of the smooth posterior part is developed from the absorbed light Horn

4:04 of a sinus venosus the smooth posterior part sinus veneer 'm developed from the absorbed right Horn of a sinus venosus and it's real proper anterior part is developed from the right half of a primitive atrium sinus mininum shows the opening of inferior vena cava at the lower end and the opening of the superior vena cava at the upper head the third is a opening of a coronary sinus you can see over here this is the opening of the coronary sinus it is exactly lies between the opening of the inferior vena cava and the right it your ventricular purifies that is also known as a writer speed orifices the coronary sinus now between the opening

4:52 of this inferior vena cava and a coronary sinus sometimes there lies some web like network over here which is known as a cheery Network okay GRE Network now in the last part in the sinus within their own post a smooth part in its posterior wall that is a small opening of a winner for this mini-me that is the opening of the tahitian will this wall Winnicott is Menem is present in the posterior wall of all the chamber of the heart but it open into the right atrium mostly through its posterior smooth wall now second the rough anterior part we have remove or cut through the anterior wall

5:38 okay like this this is the rough interior part its interior it shows the series of the transverse muscular rays which is known as a musk you leap at unity and this muscular pack Trinity arise from this Krishna terminalis and it is extending downwards and the forward towards the right atrioventricular peripheries through which the blood from the right ATM going into the right ventricle right now we see the last part in the interior that is inter atrial septum see this is the right atrium and this is the left atrium between these two lies the interatrial septum over here the interatrial septum developed from the septum primum and the

6:24 septum secundum it present was the fossa worries which is a saucer-shaped depression in the lower part of a septum and it is developed from the septum primum okay now it is having the prominent margin this margin is known as a limbus fossa worries or the annulus Ovilus which is a fridge and it is developed from the septum second sometimes there is a remnants of the foramen ovale which is present between the verse flows out what is and the fossa ovalis over here but in this case there is no remains of a foramen ovale okay so this is the interior of a right atrium now we move to the left atrium the left atrium lies posterior and the left to

7:16 the right atrium this is left atrium you can see the four pulmonary vein which is opened into the left atrium right left atrium now the left atrium it formed the left 2/3 of a base and the lab 2/3 of upper water externally and Thoreau superiorly here entero superiorly it shows the conical projection right this is known as a left auricle which wing of farts and the medially over the root of a pulmonary trunk right now it receives the for pulmonary brain which gives the oxygenated blood from the lungs now we open the left atrium

8:04 the left atrium its interior is derived embryologically from the absorbed pulmonary vein which opens into it okay now I had cut the posterior one and try to see try to show the interior of a left atrium I extend the court to visualize proper I had exposed the wall of the left atrium you can see the most of the part

8:53 is a smooth okay except that of a left auricle the left auricle interior which is which shows the muscular pattern it is a rough part okay and this part is developed from the original primitive atrium of a heart tube original primitive atrial chamber of a hearty okay now interatrial septum the interatrial septum that present between the two atria in the left atrium into atrial septum here you can see the one-zip impression this is limbus fossa ovalis which is

9:38 corresponding to the fossa wall is of right atrium okay limbus fossa ovalis so this is the interior of a left atrium now we move to the right ventricle the right ventricle is a triangular in the shape it forms the right 2/3 of a sterno costal surface right 1/3 of a diaphragmatic surface and the wall of infinite water right now we see directly interior so interior see this is the

10:25 interior of a right atrium okay you can see also here in this section but ronzo section through the heart this is the right atrium or right ventricle the interior of the right ventricle is divided into two parts the lower rough part which is known as a in flowing through which is through which the blow is coming from the right atrium into the right ventricle here so it is known as a lower rough incoming part this is roughly to present of muscular ridges which is known as making iCarly and it developed from the proximal part of a

11:13 bulbous cody's muscle now we discuss the rough part so rough in flowing part shows the trabeculae economy muscular rate which is offer three types it is better seen in this section it shows the first the line here lie near fix elevation in the wall which is known as a Regis okay these are the Regis second is a bridges which is connection between the ridges is a bridges okay and the third is a papillary muscle that is also known as a pillar this is the papillary muscle or a pillar now the papillary muscle it's one end here you can see the

12:04 papillary muscle it's one end is attached to the ventricular wall and the other end is attached to the tricuspid cuz this is the cusp or a1 tricuspid cusp through the thin string like structure which is known as a coda then they need okay yeah in this case also you can see clearly this is the one of the papillary muscle it is it's one end is attached to the ventricular wall and the other end is attached to the cusp of the wall you can see clearly the cusp of the valve and this papillary muscle is attached to the cost of the valve by the

12:50 three in string like structure which is known as a coda tendon okay now in the right ventricle there are three wrapping the papillary muscles are there that is an interior that largest the posterior the smallest and the scepter scepter is a small numerous nipple light projection okay now the base offer anterior papillary muscle is it is attached to the interventricular septum through the scepter marginal the bridge scepter marginal bridge okay the scepter marginal bridge is also known as a moderate mint or a septa

13:36 marginal trabeculae and important of it is it prevents the over distance of a right ventricle right now this interventricular septum is bulging towards the right ventricle so the cavity of a right ventricle is a threesome taking the shape here I'd take a coronal section and this is the cavity of the right ventricle this is the interventricular septum it is bulging into the right ventricle so the cavity of the right ventricle is a crease ending in the same the second the wall of a right ventricle is thinner than that of the left ventricle the ratio of the thickness is 1 is to 3 so the wall of the left ventricle is 3 times thicker

14:24 than that of the right ventricle now we see the smooth upper part that is the outgoing prop part the smooth upper part is a conical in the shape which give rise to the pulmonary top there is a smooth smooth upper part that is the outgoing part the smooth outgoing part is separated from the rough lower part by the supraventricular reached or the infantry below ventricular reached okay this one and this crest is lies between the orifice offer between the pulmonary orifice and right atrioventricular orifice supraventricular crest or the infantry below ventricular crashed

15:10 so this is the interior of a right ventricle now we we see the interventricular septum it is better seen in this horizontal section the interventricular septum is lies obliquely so it's lower part is facing forward and towards the rights and the upper surface is facing backwards and the left now this interventricular septum separate the two ventricle as well as its upper thin parts separate the left ventricle from the right atrium and the position of the interventricular septum on the surface is indicated by the inter ventricular groove which lies ND nearly as well as posteriorly now the last

15:56 chamber of the heart that is the left ventricle left ventricle is a coracle in the shape it from the left one third of a sterno costal surface left 2/3 of a diaphragmatic surface and affects more lap surface as well as left boredom now we see the interior of a left ventricle like a right ventricle it shows the inflowing over rough part with the trabeculae Carmi which shows the ridges bridges and the papillary muscle now this inflow agri part is developed from the primitive ventricle of the heart tube it is different from the right ventricle in that it shows the only two papillary muscle that is

16:43 anterior and the posterior which is attached to the cusp of a mitral valve two cusps of a mitral ball through the coda and any theme string like structure coda and any okay now the second part is an outgoing upward smooth part which is known as a outta christine's this is the out equestrian okay our Equestria mule will leads into the aortic holy fish which is guarded by the aortic valve okay and this for the smooth part outta questa bill is developed from the mid

17:31 portion of a bulbous Cody's okay so this is the interior of a left ventricle so we have seen the interior of the left ventricle we'll so it shows the food if is one is a left atrioventricular orifice which is also known as a bicuspid or mitral orifice which is guarded by the wall of a SEM them and second is a chaotic orifice how take orifice which is guarded by the semilunar chaotic one now last we see the orifice and the valve which is connecting the different chamber of the heart the first the right atrium is

18:16 connected to the right ventricle through the right atrioventricular orifice which is also known as a tricuspid orifice which is guarded by the three cusps of a1 okay this one one two and three now the blood from the right ventricle is pushed to the pulmonary trunk through the pulmonary orifice this is the pulmonary orifice which is guarded by the pulmonary one this is the semilunar pulmonary one okay now the blood into the left atrium is coming through the pulmonary vein into left atrium now the

19:03 blood from the left atrium is passage to the left ventricle through the left atrioventricular to the face which is guarded by the mitral valve or the left atrioventricular valve okay or a bicuspid wall this is the bicuspid one now the blood from the left ventricle is passed to the ascending aorta through the aortic opening which is guarded by the aortic one okay this is the semilunar erotic one having a three cusps so this is all about the heart thank you if you liked our video click on the like button and share with your friends to get the regular updates on Anatomy video bye Viper was for Anatomy subscribe to

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