[1] Traced upward, it splits to enclose the subclavius, and its two layers are attached to the clavicle, one in front of and the other behind the muscle; the deep layer fuses with the deep cervical fascia and with the sheath of the axillary vessels.

Laterally, it is very thick and dense, and is attached to the coracoid process.

The portion extending from the first rib to the coracoid process is often whiter and denser than the rest, and is sometimes called the costocoracoid membrane.

it is thin, and at the upper border of the pectoralis minor, it splits into two layers to invest the muscle; from the lower border of the pectoralis minor, it is continued downward to join the axillary fascia, and lateralward to join the fascia over the short head of the biceps brachii.

This article incorporates text in the public domain from page 437 of the 20th edition of Gray's Anatomy (1918)