What Is the Brachialis?
The flexor muscles deep in the brachialis muscles. When near fixed, make the elbow flex; when far fixed, make the upper arm close to the front arm. Start at the lower part of the anterior humerus, stop at the ulna tuberosity and coronoid process.
- Chinese name
- Brachialis
- Department
- Deep in the lower half of the biceps
- Starting point
- Lower anterior humerus
- The flexor muscles deep in the brachialis muscles. When near fixed, make the elbow flex; when far fixed, make the upper arm close to the front arm. Start at the lower part of the anterior humerus, stop at the ulna tuberosity and coronoid process.
Morphological characteristics of the brachial branch of the brachial radial nerve
- The brachialis muscle is a flexor of the upper arm. It starts from the inner and outer sides of the lower half of the humerus and the space between the medial and lateral muscles. It stops at the rough surface of the ulna and has elbow flexion and supination. It has dual innervation of musculocutaneous nerve and radial nerve. The brachial branch of the radial nerve is the muscular branch that the radial nerve sends from the elbow to the ulnar side. This muscle branch runs in the muscle space between the brachialis and radial brachialis muscles, without blood vessels and fibrous tissue crossing.
Anatomical Study of Brachial Muscle Stop
- It was found that most of the brachial muscle stops were located on the medial side of the ulna olecranon-coronal apex, and a small part was located on the outside. The total length was 21.8 ± 2.7mm (18.4 26.5mm), which can be divided into shallow and deep ends: the shallow stop All are aponeurotic tissues, with a width of 4.1 ± 1.1mm (2.3 5.3mm); while the deep end is larger and is composed of the aponeurosis on both sides and the muscle tissue in the middle, with a width of 11.2 ± 3.1 (6.8 15.1). Among them, the width of the radial aponeurosis is 1.7 ± 0.5mm (1.0 to 2.4m), the width of the ulnar aponeurosis is 2.7 ± 0.6mm (1.9 to 3.8mm), and the muscle width between the two is 6.8 ± 2.1mm. (3.9 to 9.4 mm). The width of the brachial muscle stop from the anterior bundle stop of the medial collateral ligament is 4.1 ± 0.5m (3.3 4.8mm), and the length of the proximal end of the stop is 9.3 ± 1.5mm (6.7 10.6mm) from the crown. The length of the tackle joint surface is 4.1 ± 0.3mm (3.6 4.5mm). The conclusion is that the ulnar crown process plate can be placed in the gap between the brachial muscle stop and the medial collateral ligament anterior bundle stop. However, the distance between the two is small, so it is necessary to loosen the brachial muscle stops. When the ulnar aponeurosis of the deep head of the brachialis is released, the average distance between the two can reach 6.8mm; when the middle muscle tissue is loosened at the same time, the average distance between the two can reach 13.6mm.
- The ulna coronoid is the main component of the anterior and medial columns of the elbow joint, and together with the radial head provide an anterior blocking effect to prevent posterior dislocation of the elbow joint. The coronoid process is also the attachment point of important soft tissues of the elbow joint, including the anterior joint capsule, the anterior bundle of the medial collateral ligament, and the brachialis muscle. When a steel plate is used to fix a coronoid process fracture, it can be placed between the brachial muscle stop and the medial collateral ligament anterior bundle stop. Therefore, measuring the distance between the two has important clinical significance. We measured its length to be 4.1 ± 0.5mm (3.3 to 4.8mm), with an average of less than 5mm. Because the medial collateral ligament anterior bundle plays an important role in stabilizing the elbow joint, when the width of the steel plate is large, the steel plate can only be placed by releasing the brachial muscle stops. In the anatomy we found that the deep head of the brachial muscle can be divided into two parts, namely the aponeurosis on both sides and the middle muscle. We measured the width of the deep head dead center at 11.2 ± 3.1 mm (6.8 to 15.1 mm), where the width of the radial aponeurosis was 1.7 ± 0.5 mm (1.0 to 2.4 mm) and the width of the ulnar aponeurosis was 2.7 ± 0.6 mm (1.9 to 3.5 mm), and the muscle width between the two is 6.8 ± 2.1 mm (3.9 to 9.4 mm). When the ulnar aponeurosis of the brachialis deep head stop is released, the average distance between the two can reach 6.8mm: when the middle muscle tissue is released at the same time, the maximum distance between the two can reach 13.6mm. The width of the steel plate used in clinical practice should be as small as possible to prevent the function of the muscles from being completely released when the deep head of the brachii is released.