The muscles of the human arms, which we list in today’s anatomy lesson, know, of course, everything – these are biceps, triceps and forearm muscles. Any person who is fond of bodybuilding knows what muscles are on the hands and what features of training these muscles are associated with them. We will talk about training the muscles of the hands in other articles, where we will look in detail at exercises for all the muscles of the human hands, but now we will delve into the anatomy and look at the pictures.
The muscles of the human arms are the muscles of the shoulder, forearm and hand. The shoulder has one bone in its structure – the humerus, and the forearm has two – the radius and ulna. The radius is on the side of the thumb, the ulna is on the side of the little finger. The elbow joint connects the humerus, radius and ulna and allows you to bend and unbend the arm, as well as rotate the forearm and hand. The wrist joint is located between the forearm and the hand.

Biceps.

The biceps or biceps muscle of the shoulder consists of two heads – long and short. The long head of the biceps originates from the supraarticular tubercle, and the short head from the coracoid process of the scapula. Both heads of the biceps lie along the humeral brush and are attached below the elbow to the radius. The biceps allows the arm to bend at the shoulder joint and rotate with the palm up. In this, two more muscles of the arm help him – the brachial and brachioradialis. The shoulder muscle or brachialis is located under the biceps, it starts from the bottom of the humerus and is attached to the ulna. It turns out that the biceps raises the radius, and the shoulder muscle (brachialis) – the ulna. The brachioradialis muscle starts from the humerus, runs along the entire forearm and is attached to the radius near the wrist joint.

Triceps.

The triceps or triceps muscle, as it is already becoming clear, has three heads. The long one starts from the scapula, from the subarticular tubercle. Medial and lateral heads – from the radius. All three heads are connected into one tendon, which is attached to the olecranon. Triceps is the extensor of the arm at the elbow joint. The three heads of the triceps cover the elbow joint, and the long head also covers the shoulder joint.

Muscles of the forearm.

The muscles of the forearm consist of two groups of muscles – anterior and posterior. The anterior muscles are flexors, and the posterior muscles are extensors and arch supports. Some of these muscles are responsible for the movement of the wrist, while others are responsible for finger movements. For example, turning the palm down is carried out due to the round and square pronators.
Muscles that flex the hand at the wrist: flexor carpi radialis, long palmar, and flexor carpi ulnaris.
Muscles responsible for finger flexion: deep and superficial flexors of the fingers, long flexor of the thumb.
Muscles that extend the arm at the wrist joint: extensor carpi ulnaris, extensor radialis longus and extensor radialis brevis.
Muscles that extend the fingers: extensors of the thumb, extensor of the fingers, extensor of the index finger.
Muscles that turn the arm upside down: biceps and arch support.
Muscles that turn the hand palm down: pronators (round and square).

That’s all the information about what muscles a person has on his hands! Now is the time to move on to exercises on these same muscles.