Pectoralis minor muscle

Pectoralis Minor Muscle

The Pectoralis Minor is a thin, triangular muscle, situated at the upper part of the chest, beneath the Pectoralis Major. It plays a crucial role in the movement and stability of the shoulder.

Anatomy

The Pectoralis Minor originates from the third to fifth ribs, near their costal cartilages, and inserts into the medial border and superior surface of the coracoid process of the scapula. This muscle is covered by the clavipectoral fascia.

Function

The primary function of the Pectoralis Minor is to stabilize the scapula by drawing it anteriorly and inferiorly toward the thoracic wall. This action is essential for movements such as downward rotation, protraction, and depression of the scapula. It plays a significant role in the movement of the shoulder, facilitating actions like reaching or pushing.

Clinical Significance

1. 1. 1. Tightness and Injury

Tightness or shortening of the Pectoralis Minor can contribute to various shoulder pathologies due to its role in scapular positioning. Conditions such as shoulder impingement syndrome, and thoracic outlet syndrome can be associated with abnormalities in the function or structure of the Pectoralis Minor.

1. 1. 1. Physical Therapy

Physical therapy interventions often target the Pectoralis Minor for stretching and strengthening to address shoulder pain and dysfunction. Techniques may include manual therapy, exercises, and stretches specifically designed to improve the length and strength of this muscle.

See Also

• Musculoskeletal System
• Pectoralis Major
• Scapula Anatomy
• Shoulder Impingement

References

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