What Is a Brachial Vein?

The two veins accompanying the brachial artery are called the brachial vein. The brachial vein accompanies the brachial artery in the anterior region of the brachial vein. Two brachial veins accompany both sides of the brachial artery. Generally, the expensive vein merges into the medial brachial vein at the midpoint of the arm, and there is also the expensive vein flowing into the axillary vein. The radial and ulnar veins flow into the lateral brachial vein. Along the brachial artery, the brachial vein merges into the axillary vein at the lower edge of the great circle.

The two veins accompanying the brachial artery are called the brachial vein. The brachial vein accompanies the brachial artery in the anterior region of the brachial vein. Two brachial veins accompany both sides of the brachial artery. Generally, the expensive vein merges into the medial brachial vein at the midpoint of the arm, and there is also the expensive vein flowing into the axillary vein. The radial and ulnar veins flow into the lateral brachial vein. Along the brachial artery, the brachial vein merges into the axillary vein at the lower edge of the great circle.

Chinese name

Brachial vein

Foreign name

brachial veins

Brachial vein puncture blood collection method:

The humeral vein puncture blood collection method has been widely used clinically. The method is safe, reliable, simple and easy to implement, has a high success rate, and is easy for patients to accept. However, in clinical practice, it is true that some patients fail to pump without bleeding.

Because the puncture point is 0.5cm away from the medial or lateral side of the most obvious pulsation of the brachial artery. Therefore, abnormal position of veins and arteries is the main reason for failure of puncture. Especially the vein is located in front of or behind the artery. Those with veins on one side and no veins on the other side are also prone to failure. The small nerve is located between the vein and the artery on one side, and the perforating nerve is easily damaged; especially the vein is located in front of and behind the artery, and the nerve is close to the inside of the artery, which is the most vulnerable to the nerve. Observation results confirmed that the brachial vein puncture was safe, reliable, and easy to operate. The brachial artery pulsation could be felt on the inside of the biceps tendon. Needles were inserted at 0.5cm on both sides of the artery, at an angle of 30 ~ 45 °, and the depth was 1 ~ 2cm. success. Variation of vein position should be considered when individual puncture fails, and other parts can be changed.

Brachial vein anatomy:

1. Brachial artery:

The brachial artery is the arterial trunk of the arm, and it continues from the axillary artery at the lower edge of the latissimus dorsi muscle. It descends along the medial side of the biceps to the cubital fossa. support. The brachial artery accompanies the vein and median nerve of the same name. The pulsation of the artery can be touched on the inside of the biceps tendon in the elbow socket, so it is often used as an auscultation site to measure blood pressure. If the trauma below the forearm bleeds, you can press the brachial artery backward and outward on the inside of the biceps The humerus performs hemostasis. When using a tourniquet to stop bleeding, it should be performed on the arm 1/3 to avoid injury to the radial nerve.

The brachial artery emanates from the deep brachial artery, humeral nourishing artery, superior ulnar artery and inferior ulnar artery. Distributed in the upper arm muscles, bones and elbow joints. The deep brachial artery emanates from the posterior wall of the initial segment of the brachial artery, with the radial nerve backward and outward, traveling in the radial nerve sulcus, reaching the elbow joint upward and outward, acting as the radial accessory artery. Fracture of the middle humerus is likely to damage the deep humeral artery and radial nerve. The radial and secondary ulnar arteries participate in the formation of the elbow arterial network.

2. Veins:

Veins that carry blood back to the heart. The vein starts in the capillaries and ends in the atrium. In the process of concentrating the veins, the veins continuously accepted the branch, and the diameter gradually became thicker. The blood flow direction is centripetal, the blood flow speed is slower than the arterial blood flow, and the pressure is lower. The wall is thin and the contraction is weak, and the lumen is generally slightly larger than the corresponding artery. In addition, because it is a branched complex, the volume of the venous system is more than double that of the arterial system, thereby maintaining the dynamic balance of blood flow. The deep veins that run in the deep part of the intrinsic fascia or in the body cavity are mostly accompanied by their corresponding arteries, called deep veins, often two. Subcutaneous veins, also known as superficial veins, that travel through the subcutaneous tissue, pass through them without accompanying the arteries, but communicate with the deep veins and merge into the deep veins. Many veins have venous valves on their walls. They are formed by the folds of the lining of the blood vessels. They are thin and soft, resembling a half-moon pouch with the mouth opening facing the heart. The opening of the valve along the blood flow and the blocking of the reverse blood flow are important devices to prevent the blood from flowing backward or change the direction of the blood flow. In the limbs, especially the veins of the lower limbs, there are the most valves, and most of the head and neck and chest veins have no venous valves. Venous anastomosis is more abundant. There are often abundant venous networks and venous plexuses in the deep and subcutaneous parts of the body and around certain organs, which are more widely distributed than arteries. Venous blood flow can always maintain the direction of the heart, mainly due to the suction of the heart and chest, the presence of venous valves, the contraction and relaxation of muscles around the vein, the pulsation of the arteries in the same blood vessel, and other internal and external factors. The above factors are not perfect, especially when the venous valve is incomplete, venous stasis or varicose veins can occur. Structurally, the venous wall can be divided into three layers: intima, media, and adventitia, but the boundary between the three layers is not obvious. According to the size of the tube diameter, the vein can be divided into large, medium and small grades, the tube diameter is greater than 10mm, 2-10mm and less than 2mm. In addition, the structure of veins in some parts is special, such as: dural sinus, a special venous system in the skull; plate veins, which are flat veins hidden in the cancellous bone of the skull.