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| Term | tracheal pit | ID (Ontology) | FBbt:00005036 (Fly Anatomy) | |||||||||||||||||||||||
| Definition | Deep and narrow pit formed by the invagination of a tracheal placode in a late extended germ band embryo. Invagination of the placode begins during stage 11. Branches begin to bud from the pit during stage 11, with a dorsal and ventral stem being apparent by mid-stage 12. The pit closes over during stage 13. There are 10 pairs of tracheal pits - one pair in each tracheal metamere (each segment from T2 to A8). Pits are located in the central one third of each parasegment, with the most anterior in parasegment 4 and the most posterior in parasegment 14.[ FlyBase:FBrf0064787 FlyBase:FBrf0089570 ] | |||||||||||||||||||||||||
| Also Known As | "embryonic tracheal pit" ; "tracheal sac" | |||||||||||||||||||||||||
| Comment | Note, some authors refer to tracheal pits as tracheal sacs. This ontology avoids this nomenclature in order to avoid confusion with terms referring to the tracheal air sacs of the adult. | |||||||||||||||||||||||||
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Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
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| Is a | tracheal primordium | ||
| Part of | late extended germ band embryo | ||
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External Crossreferences & Linkouts
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| UBERON:6005036 | |||