part of ciliary pocket cellular anatomical structure ciliary pocket collar pr Note that a 'flagellar collar' is described in Choanoflagellates, but this is different from the ciliary pocket collar found e.g. in Giardia; in Choanoflagellates, a single apical flagellum is surrounded by a collar of 30-40 microvilli. cilium pocket collar FPC flagellum pocket collar GO:1990900 flagellar pocket collar flagellar pore flagellar collar A constriction site at the junction of the plasma, flagellar and flagellar pocket membranes where the flagellum emerges from the cell body. Observed in some unicellular eukaryotic species such as Chlamydomonas, Giardia and Trypanosoma. cellular_component 2015-11-17T14:43:55Z