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.Continue Reading
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
According to Healthline, muscle rigidity is a condition in which the muscles are continually tense or contracted. Muscle rigidity is often a symptom of neurological problems or medicinal side effects.Full Answer >
Muscle spasms are sudden involuntary contractions of one or more muscles and often lead to cramping. Some muscles are more prone to spasms, including the calf muscles and abdominal region. Causes include vitamin deficiency, magnesium or potassium deficiency and fatigue.Full Answer >
The muscles that control the knees include the quadriceps, hamstrings and calf muscles. These muscles all work together to allow the knee to move freely in order to walk, run, kick and jump.Full Answer >
As the Stanford Visible Female explains, a gluteal muscle diagram is a 3D image of the muscles in the buttocks. According to My Weight Lifting, a diagram of the gluteal muscle should include the three gluteal muscles: the gluteus maximus, gluteus medius and the gluteus minimus.Full Answer >