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The purpose of attaching a 3cc syringe to the proximal end of the IV catheter after insertion during a cricothyrotomy is primarily to inflate the balloon of an endotracheal (ET) tube when utilized in emergency airway management. During a cricothyrotomy, where an incision is made through the skin over the cricothyroid membrane to secure an airway, inserting a catheter allows for direct ventilation access. The 3cc syringe is instrumental in managing the cuff of the ET tube, helping to create a secure seal within the trachea once the tube is in place. This seal is vital for effective ventilation and prevents air leakage during positive pressure ventilation.

Other options may have relevant contexts in airway management, but they do not directly relate to the mechanism of action taking place with the 3cc syringe following cricothyrotomy. Administering medication, securing the airway, or connecting an ET tube to the airway are not the immediate functions of the syringe in this particular procedure.