What Is the Structure of the Muscular System?

The striated muscle looks like it consists of a bundle of hair glands, and each muscle fiber has stripes. It is also called voluntary muscle or skeletal muscle. But these names are not very appropriate, because some striated muscles such as orbicularis and orbicularis are not attached to the bones; while the striated muscles of the larynx and upper esophagus do not need to be controlled and directed by the will. The true striated muscle in adults accounts for about 40% of the total body weight.

Muscle system

according to

Striated muscle,

Human body has 639 pieces

Muscles can be divided into four types: long muscles, short muscles, broad muscles and orbicularis muscles. Each muscle can be divided into muscle and

The auxiliary structures of muscle are mainly fascia,

The muscles of the human body can be divided into head and neck muscles, trunk muscles and limb muscles.

Muscular system head and neck muscles

Head and neck muscles can be divided into head and neck muscles. Head muscles can be divided into expression muscles and masticatory muscles. The facial muscles are located under the skin of the head and face, mostly from the skull, and stop at the facial skin. When muscles contract, they can affect the skin and produce various expressions. Masticatory muscles are the muscles that move the mandible, including the superficial temporal and masseter muscles, and the deep inner and outer pterygoid muscles.

Muscle system trunk muscle

Trunk muscles include back muscles, pectoral muscles, diaphragm muscles, and abdominal muscles. The back muscles can be divided into superficial and deep layers. The superficial layer has trapezius and latissimus dorsi. There are many deep muscles, mainly the iliac spine. The pectoralis major includes the pectoralis major, pectoralis minor, and intercostal muscles. The iliac crest is located between the chest and abdomen. It is a flat broad muscle that protrudes toward the chest in the shape of a fornix. It is the main breathing muscle. It assists inhalation during contraction and exhales during relaxation. The abdominal muscles are located between the lower part of the thorax and the upper edge of the pelvis and participate in the formation of the abdominal wall. Can be divided into anterior and posterior groups. The anterolateral group includes the rectus abdominis muscles located on both sides of the anterior midline and the three layers of flat latissimus lateralis. These three layers of latissimus muscles are, from shallow to deep, the external oblique muscle, the internal oblique muscle, and the transverse abdominal muscle. The back group has lumbar square muscles.

Muscle system limb muscles

The limb muscles can be divided into upper limb muscles and lower limb muscles.

A. Upper limb muscles: The upper limb muscles have fine structure and dexterous movements, including shoulder muscles, arm muscles, forearm muscles, and hand muscles. The shoulder muscles are distributed around the shoulder joint, and have the function of protecting and moving the shoulder joint. The more important one is the deltoid muscle. The arm muscles are long muscles and can be divided into two groups. The anterior group is flexors, including the biceps, brachialis, and coracalis, and the posterior group is extensors, triceps. The forearm muscles are located around the ulna and radius, and are mostly long rib muscles, which can be divided into two groups, anterior and posterior. The anterior group is the flexor group; the posterior group is the extensor group. The hand muscles are located on the palm. Divided into outer group, inner group and middle group.

B. Lower limb muscles: Lower limb muscles can be divided into hip muscles, thigh muscles, calf muscles, and foot muscles. The hip muscles start from the trunk bone and pelvis and surround the hip joint and stop at the femur. According to their parts, they can be divided into two groups. The internal hip muscles are located in the pelvis, mainly including the iliopsoas, piriformis, and obturator muscles. The external hip muscles are located outside the pelvis, mainly including the gluteus maximus, middle gluteus, gluteus minor, and obturator external muscle. The thigh muscles are divided into anterior, medial, and posterior groups, which are located at the front, medial side, and back of the femur, respectively. The front group has quadriceps and sartorius muscles. The inner group is located on the inner thigh, including pubis, long adductor, short adductor, adductor gracilis, and gracilis. The posterior group includes the lateral biceps femoris and the medial semitendinosus and semimembranous muscles. Calf muscles can be divided into anterior, lateral and posterior groups. Foot muscles can be divided into back muscles and plantar muscles.

[Children's Dance] A dance based on the physical and age characteristics of young children, reflecting the life of preschool children and expressing their thoughts, feelings and attitudes. It can increase their physical strength, promote the physiological functions of young children's bones, muscles, breathing, nervous system and circulatory system, speed up their metabolism, and keep their bodies growing. Cultivate children's good posture and noble temperament, and enhance coordination.

Take a bath immediately after meals to beware of illness] Just after eating, the human digestive system begins to work, a large amount of blood gathers in the stomach, and other organs are in a relatively ischemic state. At this time, when you take a bath, the whole body's blood vessels dilate, blood flow to the skin and muscles increases, and there is not enough blood in the stomach, which will affect digestion. It is recommended that bathing should be arranged after 1-2 hours after a meal, and the duration should not exceed half an hour.