midaxillary line

Some sources recommend the midaxillary line, in the sixth, seventh, or eighth intercostal space.

The midaxillary line, a line running vertically down the surface of the body passing through the apex of the axilla (armpit).

The axillary lines are the anterior axillary line, midaxillary line and the posterior axillary line.

A needle is inserted through the back of the chest wall in the sixth, seventh, or eighth intercostal space on the midaxillary line, into the pleural space.

Neurostimulation electrodes "are placed on the convex side of the curve in the region of the posterior to midaxillary line" in order to engage the back muscles through neuromuscular stimulation as the patient sleeps.