adult tracheal dorsal trunk [FBbt_00003039]

Longitudinal tracheal branch of the adult, dorsal to the lateral trunk. It begins anteriorly as a backwards continuation of the first spiracular trachea. It joins the lateral trunk immediately behind the first thoracic spiracle. The dorsal trunk is very broad in diameter and sac-like (forming the parenteric air sac) until reaching the region of the fifth pair of spiracles. It then narrows, extending until abdominal segment 8. In the abdomen, it is connected to the lateral trunk in each segment by a long transverse connective. At the level of the second pair of spiracles, these connectives are much shorter and stouter. The right and left abdominal dorsal trunks of each segment are connected by a transverse dorsal commissure, or dorsal anastomose.
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adult tracheal dorsal trunk

ID: FBbt_00003039

Adult Anatomy

Longitudinal tracheal branch of the adult, dorsal to the lateral trunk. It begins anteriorly as a backwards continuation of the first spiracular trachea. It joins the lateral trunk immediately behind the first thoracic spiracle. The dorsal trunk is very broad in diameter and sac-like (forming the parenteric air sac) until reaching the region of the fifth pair of spiracles. It then narrows, extending until abdominal segment 8. In the abdomen, it is connected to the lateral trunk in each segment by a long transverse connective. At the level of the second pair of spiracles, these connectives are much shorter and stouter. The right and left abdominal dorsal trunks of each segment are connected by a transverse dorsal commissure, or dorsal anastomose.

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Classification

Relationships

Parts of adult tracheal dorsal trunk (3 total)

Thumbnail Name Tags
abdominal air sac Adult, Anatomy
parenteric air sac Adult, Anatomy
tracheocyte of adult tracheal dorsal trunk Adult, Cell

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