subclavius muscle

At the lateral side of inferior surface, there is a subclavian groove for insertion of the subclavius muscle.

Along with the pectoralis major and pectoralis minor muscles, the subclavius muscle makes up the anterior wall of the axilla.

Just as with supplying the subclavius muscle, it anastomoses with the thoracoacromial artery in supplying skin areas.

It descends to the subclavius muscle in front of the third part of the subclavian artery and the lower trunk of the plexus, and is usually connected by a filament with the phrenic nerve.

The anterior surface is convex, and looks forward and upward: that of the first gives attachment to the costoclavicular ligament and the subclavius muscle; those of the first six or seven at their sternal ends, to the pectoralis major.