Merck Manual

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Syngamus trachea worms, tracheal lumen
<i >Syngamus trachea</i>  worms, tracheal lumen
Syngamus trachea worms, tracheal lumen

Male and female Syngamus trachea worms entwined in tracheal lumen. Note how the longer female worm attaches to the trachea and the shorter male worm attaches to the female worm, forming the characteristic Y-shape.

Courtesy of Dr. Jean Sander.