the collar-bone, which extends from the breast-bone to the shoulder-blade, forming part of the pectoral arch. In birds the two clavicles are united at their lower extremities into one bone, the furculum or ‘merry-thought’, õlavöötmesse kuuluv, rinna eesmis-ülemises osas paiknev S-kujuline peenike toruluu, mille külgmine ots liigestub abaluuga ja keskmine rinnakuga