Axillary lines
（重定向自Posterior axillary line）
The axillary lines are the anterior axillary line, midaxillary line and the posterior axillary line.
The anterior axillary line is a coronal line on the anterior torso marked by the anterior axillary fold. It's the imaginary line that runs down from the point midway between the middle of the clavicle and the lateral end of the clavicle; the lateral end of the collarbone is the end closer to the arm.