Intercostal Space and Neurovascular Bundle

In which groove of a rib does the neurovascular bundle of the intercostal space run?

What is the correct sequence of the intercostal neurovascular structures from superior to inferior within the costal groove?

A 38-year-old woman from Delhi undergoes elective surgical drainage of a right-sided pleural effusion. During the procedure, the surgeon makes an incision at the 7th intercostal space at the midaxillary line and carefully places the drain just above the 8th rib. Intraoperatively, the patient develops sudden severe localized pain and the anesthesiologist notes a rise in blood pressure and heart rate. Postoperatively, the patient complains of persistent pain radiating along the right lower chest wall and abdomen in a dermatomal pattern. Which nerve has been injured, and what is the clinical consequence of this injury?

A 52-year-old man from Mumbai presents to the emergency department with acute right-sided chest pain and dyspnea following a stab wound to the right chest wall at the level of the 5th intercostal space, 2 cm lateral to the sternum. On examination, he is tachycardic (HR 110/min), tachypneic (RR 24/min), and has reduced breath sounds on the right. A chest X-ray shows a moderate right pneumothorax. During emergency tube thoracostomy, the surgeon inserts the chest tube in the 5th intercostal space at the midaxillary line. Which anatomical structure is at HIGHEST risk of injury if the needle or tube is inadvertently placed superior to the rib rather than superior to the lower rib of the intercostal space?