adult tracheal section adult visceral tracheal branch fly_anatomy.ontology Adult trachea that branches mainly from the lateral trunks and from the transverse connectives. It tracheates the viscera. One visceral trachea arises between spiracles 2 and 3, one or two between spiracles 3 and 4, one between spiracles 4 and 5, two between spiracles 6 and 7, 0-2 from the fourth transverse connective and one each from the fifth, sixth and seventh transverse connective. Smaller branches arise from the dorsal trunks. visceral trachea There is some variation in the number and position of the visceral trachea, although the basic pattern is retained (Whitten, 1980). FBbt:00003070 tracheal branch