Anatomy of the Heart: Internal Features

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What is the characteristic of the pulmonary veins that open into the left atrium?

They have one orifice each

They open inferiorly at the posterior surface

They are valveless (correct)

They have a common orifice on each side

What is the position of the left auricle relative to the pulmonary trunk?

It is above the pulmonary trunk

It is behind the pulmonary trunk

It extends forwards to overlap the root of the pulmonary trunk (correct)

It is at the same level as the pulmonary trunk

What is the shape of the cavity of the left ventricle?

Oval

Triangular

Crescentic

Circular (correct)

What is the characteristic of the musculi pectinate in the left atrium?

They are smaller and fewer than those in the RA Signup and view all the answers

What is the relative size of the trabeculae carneae in the left ventricle compared to the right ventricle?

Finer and more numerous Signup and view all the answers

What is the approximate length of the heart from its base to its apex?

12 cm Signup and view all the answers

What is the characteristic of the chords attached to the left AV valve?

They are thicker and fewer than those in the RV Signup and view all the answers

Which part of the heart forms the uppermost portion of the left border?

LA auricle Signup and view all the answers

What is the average weight of the heart in an adult male?

310 g Signup and view all the answers

What is the location of the cardiac apex?

The junction of the inferior border with the left border Signup and view all the answers

Which of the following great vessels leave the heart via the superior border?

Pulmonary arteries Signup and view all the answers

What part of the heart forms the entire right border?

Right atrium Signup and view all the answers

What is the significance of the coronary sulcus?

It is a linear depression on the surface of the heart Signup and view all the answers

What is the function of the right auricle?

Overlies the commencement of the aorta and the upper part of the right coronary sulcus Signup and view all the answers

What is the function of the crista terminalis?

Is a vertical ridge internally Signup and view all the answers

What is the posterior part of the right atrium made up of?

A smooth wall produced by the incorporation of the sinus venosus Signup and view all the answers

What is the significance of the sulcus terminalis?

It is a shallow groove that produces a vertical ridge internally Signup and view all the answers

What is the function of the pectinate muscles?

Contributes to the ejection of blood from the RA to the RV Signup and view all the answers