MAIN ARTERIES IN THE REGION OF THE NECK AND THORAX OF THE AUSTRALIAN CASSOWARY

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Abstract
A mature specimen of the Australian cassowary (Casuarius australis Wallace) was dissected and a diagram of the main arteries in the neck region prepared. In the arrangement and distribution of these arteries, the cassowary differs from other species of birds previously studied. The left radix aortae and left ductus Botalli remain as a ligamentous vestige, the ligamentum aortae. The left internal carotid artery alone enters the hypapophysial canal. The right internal carotid artery is lacking or has become modified to form the ascending oesophageal artery of the adult, in the basal portion of the neck. The pattern of the arrangement of the main arteries in the neck and thorax shows a relatively primitive avian condition.

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