Crossword-Solution: AORTAE 6 letters, 55 clues 🏆 scrabble score: 6

The partitioning of the bulbus arteriosus may occur in such a manner as to assign to the two aortae a relative position, the reverse of that which they normally occupy--the pulmonary aorta springing from the left ventricle and the systemic aorta arising from the right, and giving off from its arch the primary branches in the usual order.

The heart is practically quadrilocular, the right and left halves being completely partitioned, except for a small communication, the _foramen Panizzae_, between the right and left aortae where these cross each other on leaving their respective ventricles.

The anterior loop between the ventral and dorsal aortae already described as the first aortic arch is included in the _maxillary_ or _first visceral arch_ of the soft parts (see fig.

The fused part of the two ventral aortae, just in front of the heart, forms the ascending part of the adult aortic arch, and where this trunk divides between the fifth and fourth arches (strictly speaking, the sixth and fifth), the right one forms the _innominate_ (fig.

Below this point the _thoracic_ and _abdominal aortae_ are formed by the two _primitive dorsal aortae_ which have fused to form a single median vessel.