Fasciae pectoral fascia

NEET PG Anatomy
#1

FASCIAE

PECTORAL FASCIA

It is the deep fascia covering the anterior aspect of the pectoralis major muscle. It is thin and anchored firmly to the muscle by numerous fasciculi.

Extent

  1. Superiorly, it is attached to the clavicle.

  2. Inferiorly, it is continuous with the fascia of anterior abdominal wall.

  3. Superolaterally, it passes over the deltopectoral groove to become continuous with the fascia covering the deltoid muscle.

  4. Inferolaterally, it curves round the inferolateral border of the pectoralis major to become continuous with the axillary fascia. The axillary fascia is a dense fibrous sheet that extends across the base of the axilla.

CLAVIPECTORAL FASCIA

The clavipectoral fascia is a strong fascial sheet deep to the clavicular head of the pectoralis major muscle, filling the space between the clavicle and the pectoralis minor muscle.

Extent

  1. Vertically, it extends from clavicle above to the axillary fascia below. Its upper part splits into two laminae to enclose the subclavius muscle. The posterior lamina becomes continuous with the investing layer of deep cervical fascia and gets fused with the axillary sheath.The anterior lamina gets attached to the clavicle. Its lower part splits to enclose the pectoralis minor muscle. Below this muscle it extends downwards as the suspensory ligament of axilla, which is attached to the

dome of the axillary fascia. The suspensory ligament keeps the dome of axillary fascia pulled up, thus maintaining the concavity of the axilla.

  1. Medially, clavipectoral fascia is attached to the first rib and costoclavicular ligament and blends with external intercostal membrane of the upper two intercostal spaces.

  2. Laterally, it is attached to the coracoid process and blends with the coracoclavicular ligament. The thick upper part of the fascia extending from first rib near costochondral junction to the coracoid process is called costocoracoid ligament.