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Internal structure of mammalian heart, Biology
L STRUCTURE -
Wall of auricles are thin than wall of ventricles, because they have to push the blood to ventricles only situated close to them.
Walls of ventricles are thick as they have to pump the blood quite far away. Wall of left ventricle is 3 times thicker as it has to pump the blood to complete body.
In wall of ventricle tendinous cords present.
Inner wall of ventricle is raised into low muscular ridges as columnae carneae and few large muscular elavation as papillary muscles.
Between ventricles inter ventricular septum present, bent to right side.
Lumen of left ventricle is large and lumen of R.V. is small and semilunar shape.
Between auricles and ventricles A.V. node present, from it
bundle of His
orginate, gives its branches as purkinje fibres in wall of ventricles.
Between 2 auricles inter auricular septum present. In emrbyo in it foramen ovalis aperture present, that converts in to a fossae ovalis on birth time.
In R. A. 2 opening present of pre caval & post caval. (In rabbit 3 openings).
On opening of pre cavals eustachian valve present.
Behind it coronary sinus opens on it Thebasius valve present.
In L.A. pul. veins open by common aperture (without valve).
In R.A. S.A. node or pace maker or heart of heart or node of Keith & Flack present.
It is made up of cardiac muscles & stimulate heart beat.
It is connected to vagus nerve. Pace maker system consists of pulse generator & electrodes.
Both auricles open into ventricles by auriculo ventricular valve.
In right side it is made up of 3 flaps i.e. tricuspid valve, lower edges of valve are fixed to papillary muscles of ventricle wall by chordae tendinae fibres.
In left side it is bicuspid or Mitral valve. Both valves are one way i.e. allow blood from A to V not vice versa.
From R.A. pul. aorta is originated from L.A. carotico systemic arch is originated.
At the point of origin in both 3-3 similunar valves present, that do not allow blood to come back to ventricles.
In embryo at their crossing a duct ductus arteriosus present also known as duct of Botelli, which later on convert into ligament arteriosum.
Posted Date: 10/2/2012 1:04:07 AM | Location : United States
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