Question

what do arrows a and b point to? this is an anterior view of thoracic cage with arrow a pointing to the superior portion shaped like a knot of a tie and arrow b is pointing the mid - portion which forms the bulk of the sternum

Explanation:

The manubrium is the superior - shaped part like a tie - knot of the sternum, and the body of the sternum forms the bulk of it. Arrow A points to the manubrium and arrow B points to the body of the sternum.

Answer:

A. manubrium, B. body of sternum