The external obliques are responsible for rotating the trunk and pulling the chest downward to compress the abdominal cavity. They also provide support for the rotation of the spine. These muscles are some of the largest parts of the human trunk. They have a "V" shape that follows the pattern of putting one's hands into a pocket, according to About.com.Know More
The obliques are the outermost of the abdominals. These large, flat muscles cover the sides of the trunk. A subcutaneous fat layer covers the obliques in most humans, especially females, which means they often are not visible. The obliques connect to the seven lower ribs. They contract to aid in breathing, causing the lungs to expel air. Certain motions require the external obliques to work with other muscles. These motions include flexing the spine and rotating the trunk in a direction opposite to that of the pelvis.
The subcostal and intercostal nerves connect these muscles to the brain. They play a vital role in the minor adjustments to the abdomen to maintain balance. As a result, injury to one of these muscles is often debilitating. Their blood supply comes from the intercostal arteries, the deep circumflex iliac artery and the iliolumbar artery.Learn more about Muscles
The shoulders, arms, chest, abdomen, back, buttocks, thighs and calves contain eight skeletal muscle groups. These include deltoid and trapezius muscles in the back and shoulders; biceps and triceps in the arms; pectoralis major and abdominal muscles in the chest; erector spinae, latissimus dorsi and rhomboids in the back; gluteus maximus in the buttocks; quadriceps and hamstrings in the thighs; and gastrocnemius and soleus in the calves, according to AZCentral.Full Answer >
Dips primarily work the triceps, shoulders and chest. The lower trapezius works as a stabilizer. By keeping the upper body straight throughout the dip, the triceps are emphasized. Alternatively, leaning forward during dips places more of an emphasis on the chest.Full Answer >
The pectoral muscles are located on the chest, and span from the breast bone to the shoulders. The pectoral muscles make up a large bulk of the chest on the human body.Full Answer >
According to the University of Washington Radiology Department's muscle atlas, the pectoralis major is located in the chest and forms most of the chest wall. The pectoralis major connects to the humerus, the clavicle and the sternum.Full Answer >