ukklion.blogg.se - Complete anatomy of a muscle diagram

Attachments: The muscle consists of several strips, which originate from the lateral aspects of ribs 1-8.The serratus anterior is located more laterally in the chest wall and forms the medial border of the axilla region. Function: Stabilises the scapula by drawing it anteroinferiorly against the thoracic wall.Attachments: Originates from the 3rd-5th ribs and inserts into the coracoid process of the scapula.

Both muscles form part of the anterior wall of the axilla region. The pectoralis minor lies underneath its larger counterpart muscle, pectoralis major. Fig 1 - The sternal and clavicular heads of the pectoralis major.

Innervation: Lateral and medial pectoral nerves.

The clavicular head also acts individually to flex the upper limb.

Function: Adducts and medially rotates the upper limb and draws the scapula anteroinferiorly.

The distal attachment of both heads is onto the intertubercular sulcus of the humerus.

Sternocostal head - originates from the anterior surface of the sternum, the superior six costal cartilages and the aponeurosis of the external oblique muscle.

Clavicular head - originates from the anterior surface of the medial clavicle.

It is large and fan shaped, and is composed of a sternal head and a clavicular head:

The pectoralis major is the most superficial muscle in the pectoral region. In this article, we shall look at the anatomy of the muscles of the pectoral region - their attachments, actions and innervation. It contains four muscles that exert a force on the upper limb: the pectoralis major, pectoralis minor, serratus anterior and subclavius. The pectoral region is located on the anterior chest wall.