The Muscular System
The Organs That Make Up The Muscular System
The different organs in the muscular system include cardiac muscles, smooth muscles and skeletal muscles. A complete muscle — consisting of muscle fibers, connective tissue, nerve tissue and blood tissue — is considered one organ by itself. There are roughly 600 organs in the muscular system, and these muscles make up about 40 percent of the body. These organs can be divided into four major groups: the muscles of the lower extremity, the trunk muscles, the muscles of the upper extremity and head-and-neck muscles. Most of these structures are connected by tendons.
Cerebral palsy causes reflex movements that a person can't control and muscle tightness that may affect parts or all of the body. These problems can range from mild to severe. Intellectual disability, seizures, and vision and hearing problems can occur.
Cerebral palsy is caused by a brain injury or problem that occurs during pregnancy or birth or within the first 2 to 3 years of a child's life. It can be caused by:
- Problems from being born too early (premature birth).
- Not getting enough blood, oxygen, or other nutrients before or during birth.
- A serious head injury.
- A serious infection that can affect the brain, such as meningitis.
- Some problems passed from parent to child (genetic conditions) that affect brain development.
In many cases, the exact cause of cerebral palsy is not known.