Serratus anterior is another large, fan-shaped muscle. The muscle can also be involved in pectoralis minor syndrome. Pectoralis minor is innervated by the medial pectoral nerve (C8-T1). In addition, the muscle also stabilizes the scapula on the thoracic wall. It inserts onto the medial border and coracoid process of the scapula, pulling it anteriorly and inferiorly on the thoracic wall. Pectoralis minor originates from the anterior aspect of ribs 3-5 and their costal cartilages. It also draws the scapula anteroinferiorly.ĭeep to pectoralis major is the pectoralis minor muscle. The pectoralis major is involved in a variety of arm movements, such as adduction, internal rotation, flexion and extension. Pectoralis major is innervated by the lateral and medial pectoral nerves, two branches of the brachial plexus. Abdominal (rectus) head - originates from the anterior layer of the rectus sheath.Īll the fibers converge and insert on to the crest of greater tubercle of the humerus.Sternocostal head - originates from the anterior surface of the sternum and costal cartilages of ribs 1-6.Clavicular head - originates from the anterior surface of the clavicle (medial half).The muscle has three heads giving it three points of origin: It forms the bulk of the chest area and can be easily seen on the surface in some people, for example weightlifters. Pectoralis major is a large, fan-shaped, superficial muscle located on the anterior thoracic wall. This article will give you an overview of the torso musculature and serve you as a hub from which you can hop into more detailed topics related to trunk anatomy. Intermediate: Erector spinae group (iliocostalis, longissimus, spinalis)ĭeep: Transversospinal muscles (semispinalis, multifidus, rotatores longus and brevis)ĭeepest: Interspinales, intertransversarii and levatores costarum Superficial: Spinotransversales group (splenius capitis, splenius cervicis) Intermediate: Serratus posterior superior and inferior Superficial: Latissimus dorsi, trapezius, rhomboid major and minor, levator scapulae Rectus abdominis, external abdominal oblique, internal abdominal oblique, transversus abdominis, pyramidalis, quadratus lumborum Pectoralis major, pectoralis minor, serratus anterior, subclavius, external intercostals, internal intercostals, innermost intercostals, subcostals, transversus thoracis, diaphragm Key facts about muscles of the trunk Anterior thoracic muscles Trunk muscles have a few very important functions they contribute to the protection of the thoracic and abdominopelvic viscera and they assist essential body activities such as breathing, movement, defecation and micturition. The torso muscles attach to the skeletal core of the trunk, and depending on their location are divided into two large groups: Except for the brain, the trunk houses all the vital organs of the human body. The trunk (torso) is the central part of the body to which the head and the limbs are attached.
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