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It contains four muscles that exert a force on the upper limb; the pectoralis major, pectoralis minor, Girls 32571 cyber sex anterior and subclavius. In this article, we shall look at the anatomy of the muscles of the pectoral region — their attachments, actions and innervation.
Pectoralis Major The pectoralis major is the most superficial muscle in the pectoral region. Clavicular head — originates from the anterior surface of the medial clavicle.
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Sternocostal head — originates from the anterior surface of the sternumthe superior six costal cartilages and the aponeurosis of the external oblique Bbw singles Sturgeon Bay county. Fig 1 — The sternal and clavicular he of the pectoralis major.
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Pectoralis Minor The pectoralis minor lies underneath its larger counterpart muscle, pectoralis major. Both of these muscles form part of the anterior wall of the axilla region.
Attachments: Originates from the 3rd-5th ribs, and inserts into the coracoid process of the scapula. Function: Stabilises the scapula by drawing it anteroinferiorly against the thoracic wall.
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Serratus Anterior The serratus anterior is located more laterally in the chest wall, and forms the medial border of the axilla region. They attach to the costal rib facing surface Cute female seeking guy the medial border of the scapula. Function: Rotates the scapula, allowing the arm to be raised over 90 degrees.
It also holds the scapula against the ribcage. Innervation: Long thoracic nerve.
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Fig 2 — The serratus anterior and pectoralis minor muscles. Subclavius The subclavius is small muscle, which is located directly underneath the clavicle, running horizontally.
It affords some minor protection to the underlying neurovascular structures e. Attachments: Originates from the junction of the 1st rib and its costal cartilage, inserting into the inferior surface of the middle third of the clavicle.
Function: Anchors and depresses the clavicle. Innervation: Nerve to subclavius.
If the long thoracic nerve is damaged and the serratus anterior therefore paralyseda specific clinical is produced. In cases such as this, the scapula is no longer held against the ribcage — and protrudes out of the.
Long thoracic nerve palsy is thought to most commonly occur from traction injuries, where the upper limb is stretched violently.