Costocoracoid membrane

Anatomical structure in the human body

The costocoracoid membrane is a fascial structure in the axilla (armpit) region of the human body. It is part of the clavipectoral fascia, which is a deep fascia that envelops the pectoralis minor muscle and extends from the clavicle to the axillary fascia.

Anatomy

The costocoracoid membrane is located in the upper part of the clavipectoral fascia. It extends from the first rib and the coracoid process of the scapula to the clavicle. This membrane is pierced by several important structures, including the cephalic vein, the thoracoacromial artery, and the lateral pectoral nerve.

Relations

The costocoracoid membrane is situated deep to the pectoralis major muscle and superficial to the pectoralis minor muscle. It forms part of the anterior wall of the axilla and contributes to the formation of the costocoracoid space, which is an important passageway for neurovascular structures entering the upper limb.

Function

The primary function of the costocoracoid membrane is to provide a protective covering for the neurovascular structures that pass through the axilla. It also serves as a point of attachment for the pectoralis minor muscle and helps maintain the structural integrity of the axillary region.

Clinical significance

The costocoracoid membrane is of clinical importance because it is involved in certain surgical procedures, such as axillary lymph node dissection. During such procedures, surgeons must carefully navigate around this membrane to avoid damaging the structures that pass through it. Additionally, the membrane can be involved in conditions such as thoracic outlet syndrome, where compression of the neurovascular bundle occurs.

Also see

• Clavipectoral fascia
• Pectoralis minor
• Axilla
• Thoracic outlet syndrome

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