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Quizzes on the muscles of the torso. Rotation of the humerus is achieved by the actions of the subscapularis, infraspinatus, and teres minor muscles that run from the scapula to the humerus. Medically reviewed by: Copyright © Innerbody Research 1999 - 2020. Medically reviewed by: Copyright © Innerbody Research 1999 - 2020. The Torso. These muscles allow us to raise our arm in the air or swing the arm as in throwing a ball underhand. Contraction of the diaphragm causes it to descend towards the abdomen, increasing the space of the thoracic cavity and expanding the lungs, filling them with air. Chest muscles function in respiration while abdominal muscles function in torso movement and in maintenance of balance and posture. The anterior muscles of the trunk (torso) are associated with the front of the body, include chest and abdominal muscles. These muscles, including the gluteus maximus and the hamstrings, extend the thigh at the hip in support of the body’s weight and propulsion. These three rotator muscles, along with the supraspinatus, end in wide tendons that completely surround the head of the humerus and form a structure known as the rotator cuff, which holds the humerus in place and prevents dislocation. These important muscles control many motions that involve moving the arms and head — such as throwing a ball, looking up at the sky, and raising your hand. The trapezius also contracts along the back of the neck to extend the head at the neck and hold it upright throughout the day.Nine muscles of the chest and upper back are used to move the humerus (upper arm bone). Unsubscribe at any time.Extending across the anterior surface of the body from the superior border of the pelvis to the inferior border of the ribcage are the muscles of the abdominal wall, including the transverse and rectus abdominis and the internal and external obliques. Health Testing Muscle Anatomy Arm 12 photos of the "Muscle Anatomy Arm" arm muscle anatomy test, forearm muscle anatomy, muscle anatomy in arm, muscle anatomy of arm and hand, posterior arm muscle anatomy, Human Muscles, arm muscle anatomy test, forearm muscle anatomy, muscle anatomy in arm, muscle anatomy … When these muscles contract, they elevate the pectoral girdle (as in shrugging) and move the scapula medially and posteriorly toward the center of the back (as in rowing). On the anterior side of the thoracic region, the pectoralis minor and serratus anterior muscles originate on the anterior ribs and insert on the scapula. Except for the brain, the trunk houses all the vital organs of the human body.

In the upper chest, the heart and lungs are protected by the rib cage, and the abdomen contains most of the organs responsible for digestion: the stomach, which breaks down partially digested food via gastric acid; the liver, which respectively produces bile necessary for digestion; the large and small intestines, which extract nutrients from food; the anus, from which fecal wastes are egested; the rectum, which stores feces During exhalation, the diaphragm relaxes to decrease the volume of the thoracic cavity, forcing air out of the lungs.

Other pelvic muscles, such as the psoas major and iliacus, serve as flexors of the trunk and thigh at the hip joint and laterally rotate the hip as well.Innerbody Research is the largest home health and wellness guide online, helping over one million visitors each month learn about health products and services. These important muscles control many motions that involve moving the arms and head — such as throwing a ball, looking up at the sky, and raising your hand. Muscles of the Chest Pectoral Muscles The deltoid and supraspinatus muscles run superiorly between the scapula and humerus to abduct as well as flex and extend the arm. In the upper back region, the trapezius, rhomboid major, and levator scapulae muscles anchor the scapula and clavicle to the spines of several vertebrae and the occipital bone of the skull. Please try again.We hate spam as much as you do. All Rights Reserved.Innerbody Research does not provide medical advice, diagnosis, or treatment. Deep Muscles of the Abdomen, Lower Back and Pelvis (Posterior View) Deep Muscles of the Abdomen, Lower Back and Pelvis.

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