The twin pectoral muscles, pectoralis major and pectoralis minor, are primarily used to control movement of the arms, explains Healthline. In addition, they assist deep breathing by stretching the rib cage, thus increasing its volume. Pectoral muscles are colloquially referred to as "pecs," notes Wikipedia.Know More
The pectoralis major muscle is reminiscent of a fan, notes Healthline. The wider end of the muscle is attached to the breastbone while the narrower end converges at the shoulder. The thinner pectoralis minor muscle lies under the pectoralis major. While visible in men, pectoral muscles are hidden by breast tissue in women. Pectoral muscles keep arms attached to the rest of the body, explains Wikipedia. Without these muscles, throwing balls, skipping ropes, lifting weights and flapping arms would be impossible.
Pectoral muscles can tear, impairing their function, warns Healthline. This is particularly common during weightlifting and other activities that place excessive strain on the two muscle groups. Tears tend to be more frequent in men, explains Wikipedia. This is because men have a lower tendon-to-muscle ratio, tend to exercise more energetically and have less flexible muscles.
Pectoral muscles can also develop tumors, a problem typically solved through surgery, notes Wikipedia. A far less common problem affecting pectoral muscles is Poland's Syndrome. This refers to the absence of the two muscle groups on one side of the body. The condition is almost always congenital.Learn more about Muscles
The structure of muscle tissue varies depending upon whether the muscle controls voluntary or involuntary movements, according to the National Cancer Institute. There are three types of muscle: skeletal, smooth and cardiac. Skeletal muscle is striated, smooth muscle is non-striated and cardiac muscle has characteristics of both.Full Answer >
Muscle fascicles bundle muscle fibers together for extra strength, allowing the muscle to exert more force. The diameter and length of muscle fascicles vary depending on the specific function of the muscle.Full Answer >
The function of the abdominal muscles are to protect the internal organs in the abdominal and pelvic regions and provide postural support. There is not one, but several muscles involved in the support of the abdominal area.Full Answer >
According to About.com, the function of the rectus femoris muscle is to enable knee extension and hip flexion. The rectus femoris, along with five other hip flexors, is responsible for flexion that draws the legs towards the trunk of the body.Full Answer >