Serratus anterior muscle is the surface of upper 9 ribs at side of chest - anterior aspect along entire length of medial border of scapula - (protraction) draws medial border of scapula away from vertebrae (upward rotation).
It arises from the anterior surface of the sternal half of the clavicle; from half the breadth of the anterior surface of the sternum, as low down as the attachment of the cartilage of the sixth or seventh rib; from the
The coracoclavicular fascia is pierced by the cephalic vein, thoracoacromial artery and vein, and external anterior thoracic nerve.
The Subclavius is suplied by a filament from the fifth and sixth cervical nerves; the Serratusanterior is supplied by the long thoracic, which is derived from the fifth, sixth, and seventh cervical nerves.
The long thoracic nerve serves to innervate the serratusanterior, which acts to rotate the scapula, raising the point of the shoulder and drawing the scapula forward toward the body.
Because the serratusanterior underlies the lateral aspect of the breast, in aesthetic surgery, blunt elevation of the pectoralis major laterally inadvertently elevates a small portion of the serratus muscle.
Its origin is from the lower 8 ribs, and its insertion is along the anterior half of the iliac crest and the aponeurosis of the linea alba from the xiphoid to the pubis.
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