FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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Term occlusor muscle of adult abdominal spiracle ID (Ontology) FBbt:00059065 (Fly Anatomy)
Definition A short muscle that functions in closing an adult abdominal spiracle. These muscles are attached to sclerotised lever which is in turn attached to a deep fold in the wall of spiracle at the base of the spiracular chamber. The other end is attached to a rigid part of the wall of the spiracular chamber so that its contraction closes the passage. There is no dilator muscle so the passage is probably kept open by its natural elasticity (Miller, 1950 pg 459).[ FlyBase:FBrf0007735 ]
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somatic muscle
 |__spiracular occlusor muscle_______
adult somatic muscle                 |
 |__adult somatic muscle of abdomen__|
                                     occlusor muscle of adult abdominal spiracle
                                      |__abdominal 1 spiracular muscle 105
                                      |__abdominal 2 spiracular muscle 112
                                      |__abdominal 3 spiracular muscle 118
                                      |__abdominal 4 spiracular muscle 124
                                      |__abdominal 5 spiracular muscle 130
                                      |__abdominal 6 spiracular muscle 136
                                      |__abdominal 7 female spiracular muscle 143
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Is a adult somatic muscle of abdomen
spiracular occlusor muscle
Part of adult abdominal segment
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