Axillary Line Posterior

Posterior axillary line (linea axillaris posterior, pna, bna, jna; synonym posterior axillary line) is a conventional line drawn from the lower angle of the scapula along the posterior edge of the axilla to the sixth rib. The posterior axillary line separates the back area from the lateral surface of the chest. Together with the anterior axillary line, it limits the axillary region. The posterior axillary line is one of the main anatomical landmarks during physical examination and determination of the localization of pathological changes in the chest area.

**Axillary Line Posterior** is the posterior border of the armpit. It is a line running from the posterior border of the ilium through the middle of the posterior border of the upper part of the shoulder girdle to the second metacarpophalangeal joint. The line runs along the posterior surface of the supracondylar fossa of the humerus, along the posterior border of the pectoralis major muscle and between the pectoralis major and minor muscles (if present).

The posterior axillary line is important in the diagnosis of hemophilia A, since normally blood does not flow from the axillary vein into the posterior tibial vein. In case of diagnosis XIII,