This is an idealized depiction of a flagellar pocket region. 

Click on the numbers in the picture to learn more about each structure.

 The flagellar pocket (1) is formed by an envagination of the plasma membrane where the flagellum emerges from the cell body. The envagination forms a pocket due to the presence of adhesion zones (2) that attach the two lipid bi-layers to one another and create a semi-permeable extracellular barrier. The flagellar pocket is free of obstructing subpellicular microtubules which allows the flagellar pocket membrane to participate in membrane scission and fusion events (exo- and endo-cytsosis).  Although the flagellar pocket is a critical organelle for the biology of a trypanosome, very little is currently known about how molecules get to and from the flagellar pocket.  The envagination that forms the flagellar pocket also forms the lumen of the flagellum through which the flagellar axoneme (3) passes. The flagellar axoneme originates from the basal body complex (4) and thus is oriented with its fast ("+") end at the anterior end of the cell.  The flagellum is anchored to the cell via the paraflagellar rod (PFR) (5) and the flagellum attachment zone (FAZ) filament (6).

The paraflagellar rod attaches to both the axoneme and the FAZ filament by uncharacterized cross links, and the paraflagellar rod is composed of three matrix like parts. To learn more about the structure of the axoneme and the PFR click HERE.  The FAZ filament resides on the cytoplasmic side of the cell and is attached to the plasma membrane via an uncharacterized attachment complex. It is the physical properties of the axoneme, PFR, and FAZ that convert the flagellar beat to cellular movement.

Immediately adjacent to the FAZ filament is a specialized reticulum associated quartet of microtubules (7). The exact function of these four specialized microtubules or associated reticulum is currently unknown. Nonetheless, these structures co-purify with the flagellar fraction of the cytoskeleton (Calcium insoluble fraction).