Anterior cog muscle
Anterior toothed muscle , m. Serratus anterior, flat, wide, located in anterolateral section of thoracic wall. The upper part of it is covered with a large pectoral muscle, the lower part lies superficially, covered with the thoracic fascia. The muscle begins 8-9 teeth from the outer surface of 8-9 ribs and from the tendon arch between 1 and 11 ribs.
Going back and forth, covers the outer surface of the ribs, fits under the shoulder blade and is attached along its medial edge and to its lower corner. The greatest development is achieved by those muscle bundles that attach to the area of the lower corner of the scapula.
Function: pulls the scapula from the spinal column; The lower tufts, in addition, sweep the lower angle of the blade laterally and impart to it a rotational movement around the sagittal axis. Together with the rhomboid muscle fixes the scapula to the surface of the chest. With the immobile girdle of the upper limb, the anterior dentate muscle is also an auxiliary respiratory muscle (participates in the inspiration act).
Innervation: n. Thoracicus longus (CV-CVII).
Blood supply: aa. Thoracodorsalis, thoracica lateralis, inlercostales.
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