What is the function of the biceps brachii

Every part of our body is very important. Damage to any part will bring many negative effects to our lives. So what are the functions of the biceps? As we all know, the biceps are the muscles in our arms. We must use our arms in our daily life and study. Once there is a problem with the biceps, it will affect our lives. Next, let us understand what the function of the biceps is?

When the joint is flexed and fixed distally, the biceps brachii brings the upper arm closer to the forearm. Electromyographic observations showed that the biceps brachii only had obvious electromyographic activity when the forearm was externally rotated with the palm facing forward and the elbow flexed. However, when the forearm is rotated inward, even when the palm is turned sideways to the body or the elbow is bent behind the body, there is little or no potential activity in the biceps brachii. This is also one of the main reasons why biceps exercises basically make the palms hold the equipment forward, located in the superficial layer of the anterior muscles of the upper arm. Function: Flexes the shoulder, elbow and supinates the forearm. When the biceps brachii contracts, the elbow joint flexes; when the biceps brachii relaxes, the elbow joint extends or the forearm hangs down.

The main muscle groups that move the elbow joint: The main muscle groups that move the elbow joint belong to the upper arm muscles and forearm muscles according to their location. They originate from the scapula and humerus and insert into the radius and ulna. When contracted, they enable the forearm to flex and extend. The main muscles that flex the elbow. Located in front of the frontal axis of the elbow joint, there are the biceps brachii, brachialis, brachioradialis and pronator teres.

Location and shape of the biceps brachii: Located subcutaneously on the front of the upper arm, the upper part is covered by the deltoid and pectoralis major muscles. The belly of the muscle is fusiform, and its outline is clearly visible when the elbow is flexed. This muscle has long and short biceps, with muscle bundles arranged in parallel, making it a biarticular muscle.

Origin: The long head originates from the supraglenoid tubercle of the scapula, and the short head originates from the coracoid process of the scapula.

Insertion point: The long head passes through the shoulder joint and descends through the intertubercular groove, merging with the short head in the middle of the humerus to form a spindle-shaped muscle belly. The tendon inserts into the radial tuberosity and forearm fascia.

Function: When nearly fixed and contracted, the upper arm is flexed at the shoulder joint and the forearm is flexed and externally rotated at the elbow joint. When the forearm is in an externally rotated position, the muscle strength can be fully used to flex the elbow; when the forearm is in a neutral position or internally rotated position, the muscle strength used to flex the elbow is gradually weakened. When performing distal fixed contraction, bend the upper arm at the elbow joint and bring it closer to the forearm. When this muscle contracts, it can also tense the forearm fascia and intermuscular septa, thereby providing additional support structure for the forearm muscles.

The biceps are the legendary "face" muscles, that is, strong biceps will have a sense of beauty and strength, but in daily life and movements, the biceps are not the main and most useful muscles. Its opposite, the triceps brachii, is the real contributor. A balanced sense of strength also requires the coordinated development of muscles throughout the body.

Through the above understanding of the functions of the biceps, we can see that the biceps has many functions, and of course they are all relatively important. Therefore, in daily life, we must protect the biceps. Once we find that there is something abnormal in our arms, we must go to a regular hospital for treatment and examination in time to minimize the damage of the disease to our body.