The brachial artery. It is the continuation of the axillary artery, which, as soon as it has passed behind the tendon of the pectoralis major, receives the name of brachial. It runs down on the inside of the arm, over the musculus coraco brachialis and anconeus internus, and along the inner edge of the biceps behind the vena basilica, giving out small branches as it passes.

Between the axilla and the middle of the arm it is covered only by the skin and fat, but afterwards it is hid under the biceps, and runs obliquely forward as it descends, at some distance from the internal condyle; but it does not reach the middle of the flexure of the arm. Below the fold of the arm it divides into the cubitalis and radialis.

From its upper and inner part it sends off a particular branch, which runs obliquely downward and backward, over the anconaeus, and then turns forward again near the external condyle, where it communicates with a branch of the radial artery. A little below the insertion of the teres major it sends off another branch, which descends, is united with the radial artery, and with the cubital.

The common trunk of the brachial artery having reached the flexure of the arm, runs, together with a vein and nerve, immediately under the aponeurosis of the biceps, and passes under the vena mediana, detaching branches on each side to the neighbouring muscles.

Sometimes, though very rarely, the brachial artery is divided from its origin into two large branches, which run down on the arm, and afterwards on the fore arm, where they are called cubitalis and radialis. Winslow.

Brachialis externus and internus; these are the Brachiaeus externus and internus.