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
While both the pectoralis major and pectoralis minor muscles control the movements of the arm, the pectoralis major is specifically responsible for its lateral, vertical and rotational movement. In addition to this primary function, both pectoral muscles also aid in the action of deep breathing.Full Answer >
The external oblique refers to two broad, thin, superficial muscles that rest on the lateral sides of the body's abdominal region; the internal oblique is immediately below the external oblique. The internal and external oblique muscles run from the rib to the pubic area and diagonally cross while approaching the side of the midsection.Full Answer >
Humans have two internal oblique muscles, which are located on either side of the rectus abdominis (the "six-pack" muscles). One quick way to locate them is to place a hand below the armpit and follow the side of the torso below the ribs.Full Answer >
The muscular system is responsible for the movement of the human body, circulation of blood throughout the body and maintaining posture. Together with the skeletal system, the muscular system forms the musculoskeletal system, which is mainly responsible for the movement of the body.Full Answer >