Question

The remnants of ductus arteriosus in the adults is called

• A. columnae carneae
• B. fossa ovalis
• C. foramen ovale
• D. ligamentum arteriosum

Answer 1

The correct option is D ligamentum arteriosum

The ductus arteriosus is a small blood vessel that connects the pulmonary trunk and the aorta in the embryo. This duct gets closed at the time of birth and only a ligament remains as a part of that which is attached to both the arches at their crossing point. This remnant of ductus arteriosus is called ligamentum arteriosum which is present in adults.

Foramen ovale is the opening of the right atrium into the left atrium which is present only in the foetal stage. At this stage the lungs are non-functional, so the blood circulation is by-passed and blood reaches the left atrium directly from the right atrium through foramen ovale. At the time of birth, foramen ovale gets closed and leaves an oval depression there which is known as fossa ovalis.
Columnae carneae are the muscular ridge or projection on the walls of ventricles. These are connected to the papillary muscles to which the chordae tendineae are attached. Columnae carneae divides the ventricular cavity into small spaces known as the fissures.