Its course is organized by two key landmarks. The vessel begins at the lateral border of the first rib, where it continues from the subclavian artery, and it ends at the inferior border of the teres major muscle, where it becomes the brachial artery. These boundaries help orient anatomical study and clinical examination.
The transition marks a change in the named arterial segment supplying the limb. Before the inferior border of the teres major, the vessel is identified as the axillary artery; beyond that landmark, it is called the brachial artery. Recognizing this continuity helps students follow blood flow through the upper limb without treating the vessels as separate systems.
Branches arising from the vessel extend its supply beyond the main channel and serve regions around the shoulder, thoracic wall, and surrounding muscles. Their distribution connects the artery’s central route through the axilla with nearby tissues. Studying these branches therefore adds regional detail to upper-limb circulation and explains why local anatomy matters in vascular assessment.
The artery must be interpreted in relation to the axilla, shoulder region, thoracic wall, and teres major muscle. These neighboring structures provide the spatial context for tracing its path and identifying its endpoint. Such relationships are important because anatomical orientation supports accurate physical examination and helps clinicians understand where vascular injury or surgical intervention may involve the vessel.
Anatomical knowledge allows an examiner to interpret the vessel within its expected route through the axilla and toward the upper limb. The first-rib and teres-major landmarks provide reference points for identifying the arterial segment being considered. This regional framework supports more precise examination and helps distinguish the axillary portion from the adjoining subclavian and brachial segments.
Its position and continuity make it clinically important in procedures and injuries involving the axilla, shoulder, thoracic wall, or upper limb. Knowing where it begins, where it becomes the brachial artery, and which nearby regions receive its branches helps relate a local problem to the broader arterial pathway and surrounding tissues.