Question

Foetal passage between aortic and pulmonary arches is
A) Foramen rotundum
B) Foramen caecum
C) Ductus arteriosus
D) Ligamentum arteriosum

Answer 1

Hint: Foetal passage plays a principal role in allowing the movement of the blood from the right ventricle.

Complete Answer:
Option A: Foramen rotundum represents a circular hole within the sphenoid bone connecting the pterygopalatine fossa with the middle cranial fossa. This serves as one of the several circular apertures situated at the basal region of the human skull within the anterior and the medial portion of the sphenoid bone. Thus, this is an incorrect option for the given question.

Option B: The frontal crest of the frontal bone ends itself in the form of a small notch which later gets converted to foramen called foramen caecum. This conversion is facilitated by ethmoid articulation. Thus, this is an incorrect option for the given question.

Option C: Ductus arteriosus or Ductus Botalli represents a blood vessel present within the developing foetus that plays a prominent role in connecting the pulmonary arterial trunk with that of the proximal descending aorta. Thus, this is the correct option for the given question.

Option D: Ligamentum arteriosum is defined as a small ligament representing the remnant portion of the ductus arteriosus which develops within the first three weeks of the child's birth. Thus, this is an incorrect option for the given question.

Thus, the correct answer for the given question is Option C i.e. ductus arteriosus.

Note: After birth, the ductus arteriosus normally undergoes a closure within the first two or three days as it is no longer needed.