Chambers of heart, Biology

Assignment Help:

The ventricles are separated from each other by the interventricular septum and the atria are separated from each other by the interatrial septum. The interior of the right atrium has a rough anterior part, the atrium proper and a smooth part called the sinus venarum. Also it has an appendage called the auricle. All the large veins open into the smooth part. The opening of the superior vena cava is situated in its upper and posterior part and that of inferior vena cava into its lower part, close to the interatrial septum. The opening of the inferior vena cava is bounded by a fold called the valve of the inferior vena cava. Just to the left of this is the opening of the coronary sinus. Besides these there are small openings called venae cordis minimae for small veins of the heart.

1087_CHAMBERS OF HEART.png

The sinus venarum and the atrium proper meet at a muscular ridge called the  crista terminalis which corresponds to a groove externally called the  sulcus terminalis.

Musculi pectinati are the ridges found in the atrium proper. The interatrial septum shows an oval depression called the  fossa ovalis in its lower part, the upper margin of which forms a curved ridge called the  limbus fossa ovalis. The wall of the fossa ovalis is thin and represents the embryonic septum primum. The limbus fossa ovalis represents the lower curved edge of the septum secundum.  The right atrium opens into the right ventricle through the right atrioventricular orifice, which is guarded by the tricuspid valve.


Related Discussions:- Chambers of heart

How is the fluid that fills the nucleus called, The aqueous fluid that fill...

The aqueous fluid that fills the nuclear region is known as karyolymph, or nucleoplasm. In the fluid there are proteins, enzymes and other significant substances for the nuclear me

Dietary management of constipation, Q. Dietary Management of Constipation? ...

Q. Dietary Management of Constipation? Management of constipation lies in developing regularity of habit through a bowel- training programme and by establishing good healthy ha

Wbcs types, mode of action of wbcs types

mode of action of wbcs types

Coniferous forest - ecosystem, Coniferous forest - Ecosystem Cold regi...

Coniferous forest - Ecosystem Cold regions with high rainfall and strongly seasonal climates with long winters and fairly short summers are characterised by boreal coniferous

What are the functions of fibers, Of which substance do elastic fibers of t...

Of which substance do elastic fibers of the connective tissue are made? What are some functions of these fibers? The elastic fibers are made of a protein called elastin. Ela

Zoology, what is hydrostatic skeleton?

what is hydrostatic skeleton?

Explain the interaction of vitamin a with vitamin e, Explain the Interactio...

Explain the Interaction of Vitamin A with Vitamin E? Of the various nutrients, the interaction of vitamin E, proteins, zinc and iron with vitamin A is of significance. Know? Le

.development, what is the function of the larval stage in the development o...

what is the function of the larval stage in the development of the young of five named animals

Etiologic factor of ulcerative colitis, Q. Etiologic factor of ulcerative c...

Q. Etiologic factor of ulcerative colitis? No single etiologic factor has been identified although genetic auto-immune factors are thought to be involved. Although exacerbation

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd