Overview Of Chest Muscles The pectoral region is located on the anterior chest wall. it contains four muscles that exert a force on the upper limb: the pectoralis major, pectoralis minor, serratus anterior and subclavius. in this article, we shall look at the anatomy of the muscles of the pectoral region – their attachments, actions and innervation. Teres major: this muscle helps rotate the upper arm. serratus anterior: located in the rib cage, this muscle keeps the shoulder blade against the chest wall and helps rotate the shoulder blade.
Anatomy Chest Muscles Diagram Muscles Of The Thoracic Vrogue Co Pectoralis major. the biggest chest muscle, extending from the shoulder region across the front of the chest, covering the ribs. origin: in two heads, from the clavicle and the costal cartilages of the 1st 6th ribs. insertion: bicipital groove and greater tubercle of the humerus. Nine muscles of the chest and upper back are used to move the humerus (upper arm bone). the coracobrachialis and pectoralis major muscles connect the humerus anteriorly to the scapula and ribs, flexing and adducting the arm toward the front of the body when you reach forward to grab an object. on the posterior side of the arm the teres major. There are 11 pairs of external intercostal muscles. they run inferoanteriorly from the rib above to the rib below, and are continuous with the external oblique of the abdomen. attachments: originate at the lower border of the rib, inserting into the superior border of the rib below. actions: elevates the ribs, increasing the thoracic volume. The thoracic wall is made up of five muscles: the external intercostal muscles, internal intercostal muscles, innermost intercostal muscles, subcostalis, and transversus thoracis. these muscles are primarily responsible for changing the volume of the thoracic cavity during respiration. other muscles that do not make up the thoracic wall, but attach to it include the pectoralis major and minor.
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