22.214.171.124. The thorax
1. Remove the left side of the thorax.
2. Excavate, removing the flight muscles and lowering the walls as the work proceeds.
3.1. the attachment of the vertical muscles to the floor and roof of the thorax;
the attachment of the longitudinal muscles to the roof and first phragma in
front, and to the second phragma in
aorta, which can be found when approaching the mid-line of the thorax, between
the right and left sets of
longitudinal muscles, and below it
3.4. the oesophagus;
3.5. the ganglia;
3.6. the commissures;
.7. the anterior end of the ventral diaphragm, which enters the thorax through the petiole.
4. Remove everything else.
5.1. the direct wing muscles on the inner surface of the right hand wall of the thorax.
A special preparation to show the direct muscles can easily be made by slicing off one side of a thorax with a razor blade and trimming away debris.