Explanation

Pectoral girdle (shoulder girdle) composed of two similar halves. Which are united midventrally but sparated dorsally. Each half is made up of supra scapula (a calcified cartilage), scapula, coracoids, precoracoid, epicoracoid and paraglenoid cartilage. Posteriorly, scapula forms a deep cup like depressing the glenoid cavity.