The distribution of muscles in the upper limbs, what are the muscles of the upper limbs

Upper limb muscles. It can be divided into shoulder muscles, arm muscles, forearm muscles, and hand muscles.

1 shoulder muscles. There are mainly deltoid muscles.

Supraspinatus, infraspinatus, teres minor, teres major.

subscapularis muscles, etc.

Deltoid muscles: located in the shoulder, can be subdivided into anterior, middle, and posterior fascicles.

2 brachials. It is divided into two groups.

1) Anterior group: mainly biceps.

Coracobrachial, brachial, etc.

Biceps: Two heads that act on the elbow joint. The elbow can be flexed and the forearm supinated.

2) Posterior group: triceps.

Three heads, acting on the elbow joint. The elbow joint can be extended.

3 Forearm muscles.

It is more complex and is located in the radius and ulna.

The surrounding area includes two groups, each of which can be divided into two layers: shallow and deep. The anterior group is generally the flexor muscles (elbow flexion, wrist flexion, palmar flexion, finger flexion) or pronator muscles (forearm pronation), and the posterior group is generally extensor (elbow extension, wrist extension, palm extension, finger extension) or supinator muscle (forearm supination), and the function of each muscle is mostly consistent with the name.

1) Anterior group: a total of 9 pieces, the superficial layer from the radial side to the ulnar side is: brachioradialis muscle.

Pronator teres, flexor carpi radialis, palmaris longus, flexor digitorum superficialis, and flexor carpi ulnaris.

2) Posterior group: a total of 10 pieces, the superficial layer from radial to ulnar is: extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum digitor, extensor digitorum digitorum and extensor carpi ulnaris.

4 Hand muscles. It can be divided into lateral group, middle group, and medial group.

1) Lateral group: more developed, with 4 pieces, acting on the thumb, bulging to form thenar.

2) Intermediate group: located between the palms or metacarpal bones.

3) Medial group: There are 3 pieces that act on the little finger to form a small thenar.

The muscle distribution of the upper limbs, the four pectorals, the abdominal muscles, the red biceps, the triceps, and the back muscles, these are all types of muscle distribution.

The muscles of the upper limbs mainly include the palms, arms, shoulders, chest, abdomen, face, and neck muscles.

The specific distribution of upper limb muscles can be queried accordingly by exercise physiology.

The muscles of the upper limbs are: upper arm muscle, coracobrachialis muscle, biceps brachii, triceps, deltoid, brachialis muscle, forearm muscle, brachioradialis muscle, pronator teres, carpi radialis flexor, palmaris longus muscle, hand muscle, ulnar carpi flexor, and flexor pollicis brevis muscle.

Compared with the lower limbs, the upper limbs of human beings have light bones, thin and loose joint capsules, fewer collateral ligaments, more muscles, and smaller and slender muscles, so they have flexible movements.

1 Pinyin 2 Annotations.

shàng zhī jī

The upper limb muscles are a general term for the bony muscles of the upper limbs. It can be divided into shoulder muscles, upper arm muscles, forearm muscles and hand muscles. The shoulder muscles start at the shoulder blades and clavicle and end at the upper end of the humerus and move the shoulder joint.

There are 6 deltoids, subscapulars, supraspinatus, infraspinatus, teres minor and teres major on each side. The upper arm is the flexor muscle group in front, the biceps brachii in the superficial part, the long head starts above the shoulder glenoid, the short head starts in the coracoid process, the two ends are combined, and the front of the elbow joint ends at the upper end of the radius. In the deep part there are the coracobrachialis and brachialis muscles.

Behind it is the extensor muscles, with only one triceps, the long head starts below the glenoid of the shoulder, and the medial head and lateral head are on the medial and lateral sides of the long head, respectively, and the three heads are combined to terminate at the olecranon of the ulna. The anterior groups of forearm muscles are, superficial brachioradialis, pronator teres, extensor carpi radialis, palmaris longus, and ulnar carpi extensor; The middle layer refers to the superficial flexor muscles; The deep layers include flexor pollicis longus, deep digitorum muscles, and pronation muscles. The posterior group of forearm muscles are the superficial extensor carpi radialis longus, extensor carpi radialis brevis muscle, extensor digitorum maximum, extensor propria propria of the little finger, and extensor carpi ulnaris; The deep muscles are the supinators, abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, and extensor propicis of the index finger.

The lateral group of hand muscles includes abductor pollicis brevis, flexor pollicis brevis brevis and hallucis palmaris muscle, and the adductor pollicis can abduct the thumb, flex the thumb, and adduct the palmar and adductor thumb, respectively. There are 4 vermiform muscles, 3 interosseous volar muscles, and 4 dorsal dorsal muscles in the middle group of hand muscles. The interosseous muscles bring the fingers closer together and spread out, and the interosseous muscles and vermiform muscles also have the role of flexing the metacarpophalangeal joints and knuckles.

The medial muscles of the hand muscles include the abductor of the little finger, the flexor of the little finger, and the metacarpal muscle, which abduct and flex the little finger, flexor little finger, and the palmar muscle, respectively.