Muscle fibers vary in size

Introduction When you look at the muscle groups, you will find that the muscles are bundled by the same muscle fibers as a cable. These cables are combined into a thicker and longer cable group, and when the muscles are stressed, they shrink like a spring. Within the thickest cables are muscle fibers, nerves, blood vessels, and connective tissue. Each muscle fiber is composed of smaller myofibrils. Each of the myofibrils consists of two filamentous proteins (myosin and actin) entangled together. This is the most basic unit of muscle.

Cause

1. Genetic factors.

2. Progressive muscular dystrophy.

3. Muscle-related nerve damage.

4, muscle fiber atrophy, hypertrophy, division, muscle center shift. Muscle fiber degeneration, necrosis, regeneration, or accompanied by phagocytosis.

5, muscle fiber structure changes and abnormal substances, such as mitochondria, glycogen, fat, tube aggregation, rod-like body.

6. Some enzyme activities in muscle fibers change. Interstitial connective tissue hyperplasia, fat infiltration, vascular changes and inflammatory cell infiltration.

an examination

Related inspection

EMG spinal activity

1. When observing the patient's symptoms, it can be found that the patient has different degrees, muscle atrophy in different parts, and muscle contraction is weak.

2. When performing a biopsy, it can be found that the muscle fiber size of the muscle is the most important diagnostic criterion for this disease.

Differential diagnosis

Symptoms of muscle fiber size need to be identified as follows.

First, lumbar muscle fibritis

1. Local pain, chills, numbness, muscle spasms and movement disorders.

2, pain often occurs in the morning, activity, heat reduction or disappear.

3, there are obvious limitations of tenderness.

4. Pain disappeared after injection with procaine.

5. Auxiliary inspection: There is no abnormality in X-ray examination. Laboratory tests for anti-"O" or erythrocyte sedimentation rate are normal or slightly higher.

Second, trauma causes muscle fibers to be unequal

1. Have a history of trauma.

2, muscle contraction weakness, asymmetry atrophy.

3, when performing a hospital biopsy, you can find that the phenomenon of muscle fiber inequalities can be diagnosed.

4. When observing the patient's symptoms, it can be found that the patient has different degrees, muscle atrophy in different parts, and muscle contraction is weak.

5. When performing a biopsy, it can be found that the muscle fiber size of the muscle is the most important diagnostic criteria for this disease.

The material in this site is intended to be of general informational use and is not intended to constitute medical advice, probable diagnosis, or recommended treatments.