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Shoulder Girdle.—Scapula, coracoid and clavicle, meet to form the foramen triosseum, through which passes the tendon of the supracoracoideus, or subclavius muscle to the tuberculum superius of the humerus.

This great muscle covers completely the supracoracoideus, generally described as the second pectoral, or subclavius muscle, in reality homologous with the mammalian supraspinatus muscle.

The thirty which dilate the Breast are equally plac'd to the number of Fifteen, viz. the Subclavius, the Serratus Major Anticus, the two Serrati Postici, and the eleven external Intercostals.

In a few cases the interposition of some fibres of the subclavius muscle between the fragments has prevented perfect reduction.